diff --git a/netwerk/test/unit/test_421.js b/netwerk/test/unit/test_421.js
index 17658641ed8d..7a9e07029102 100644
--- a/netwerk/test/unit/test_421.js
+++ b/netwerk/test/unit/test_421.js
@@ -1,5 +1,5 @@
 Cu.import("resource://testing-common/httpd.js");
-Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/NetUtil.jsm");
 
 XPCOMUtils.defineLazyGetter(this, "URL", function() {
   return "http://localhost:" + httpserver.identity.primaryPort;
@@ -22,19 +22,11 @@ function setup_test() {
 
   channel = setupChannel(testpath);
 
-  channel.asyncOpen(new ChannelListener(checkRequestResponse, channel), null);
+  channel.asyncOpen2(new ChannelListener(checkRequestResponse, channel));
 }
 
 function setupChannel(path) {
-  ios = Cc["@mozilla.org/network/io-service;1"].getService(Ci.nsIIOService);
-  var chan = ios.newChannel2(URL + path,
-                             "",
-                             null,
-                             null,      // aLoadingNode
-                             Services.scriptSecurityManager.getSystemPrincipal(),
-                             null,      // aTriggeringPrincipal
-                             Ci.nsILoadInfo.SEC_NORMAL,
-                             Ci.nsIContentPolicy.TYPE_OTHER);
+  var chan = NetUtil.newChannel({uri: URL + path, loadUsingSystemPrincipal: true});
   chan.QueryInterface(Ci.nsIHttpChannel);
   chan.requestMethod = "GET";
   return chan;
diff --git a/netwerk/test/unit/test_cache2-29a-concurrent_read_resumable_entry_size_zero.js b/netwerk/test/unit/test_cache2-29a-concurrent_read_resumable_entry_size_zero.js
index 8bc4fbe7eb08..d291b5f665c2 100644
--- a/netwerk/test/unit/test_cache2-29a-concurrent_read_resumable_entry_size_zero.js
+++ b/netwerk/test/unit/test_cache2-29a-concurrent_read_resumable_entry_size_zero.js
@@ -13,6 +13,8 @@ This test is using a resumable response.
 
 Cu.import("resource://testing-common/httpd.js");
 Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/NetUtil.jsm");
+
 
 XPCOMUtils.defineLazyGetter(this, "URL", function() {
   return "http://localhost:" + httpServer.identity.primaryPort;
@@ -21,16 +23,7 @@ XPCOMUtils.defineLazyGetter(this, "URL", function() {
 var httpServer = null;
 
 function make_channel(url, callback, ctx) {
-  var ios = Cc["@mozilla.org/network/io-service;1"].
-            getService(Ci.nsIIOService);
-  return ios.newChannel2(url,
-                         "",
-                         null,
-                         null,      // aLoadingNode
-                         Services.scriptSecurityManager.getSystemPrincipal(),
-                         null,      // aTriggeringPrincipal
-                         Ci.nsILoadInfo.SEC_NORMAL,
-                         Ci.nsIContentPolicy.TYPE_OTHER);
+  return NetUtil.newChannel({uri: url, loadUsingSystemPrincipal: true});
 }
 
 const responseBody = "response body";
@@ -60,9 +53,9 @@ function run_test()
   httpServer.start(-1);
 
   var chan1 = make_channel(URL + "/content");
-  chan1.asyncOpen(new ChannelListener(firstTimeThrough, null), null);
+  chan1.asyncOpen2(new ChannelListener(firstTimeThrough, null));
   var chan2 = make_channel(URL + "/content");
-  chan2.asyncOpen(new ChannelListener(secondTimeThrough, null), null);
+  chan2.asyncOpen2(new ChannelListener(secondTimeThrough, null));
 
   do_test_pending();
 }
diff --git a/netwerk/test/unit/test_cache2-29b-concurrent_read_non-resumable_entry_size_zero.js b/netwerk/test/unit/test_cache2-29b-concurrent_read_non-resumable_entry_size_zero.js
index 7589841824a9..67f6467bb235 100644
--- a/netwerk/test/unit/test_cache2-29b-concurrent_read_non-resumable_entry_size_zero.js
+++ b/netwerk/test/unit/test_cache2-29b-concurrent_read_non-resumable_entry_size_zero.js
@@ -15,6 +15,7 @@ This test is using a non-resumable response.
 
 Cu.import("resource://testing-common/httpd.js");
 Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/NetUtil.jsm");
 
 XPCOMUtils.defineLazyGetter(this, "URL", function() {
   return "http://localhost:" + httpServer.identity.primaryPort;
@@ -23,16 +24,7 @@ XPCOMUtils.defineLazyGetter(this, "URL", function() {
 var httpServer = null;
 
 function make_channel(url, callback, ctx) {
-  var ios = Cc["@mozilla.org/network/io-service;1"].
-            getService(Ci.nsIIOService);
-  return ios.newChannel2(url,
-                         "",
-                         null,
-                         null,      // aLoadingNode
-                         Services.scriptSecurityManager.getSystemPrincipal(),
-                         null,      // aTriggeringPrincipal
-                         Ci.nsILoadInfo.SEC_NORMAL,
-                         Ci.nsIContentPolicy.TYPE_OTHER);
+  return NetUtil.newChannel({uri: url, loadUsingSystemPrincipal: true});
 }
 
 const responseBody = "c\r\ndata reached\r\n3\r\nhej\r\n0\r\n\r\n";
@@ -60,9 +52,9 @@ function run_test()
   httpServer.start(-1);
 
   var chan1 = make_channel(URL + "/content");
-  chan1.asyncOpen(new ChannelListener(firstTimeThrough, null, CL_ALLOW_UNKNOWN_CL), null);
+  chan1.asyncOpen2(new ChannelListener(firstTimeThrough, null, CL_ALLOW_UNKNOWN_CL));
   var chan2 = make_channel(URL + "/content");
-  chan2.asyncOpen(new ChannelListener(secondTimeThrough, null, CL_ALLOW_UNKNOWN_CL), null);
+  chan2.asyncOpen2(new ChannelListener(secondTimeThrough, null, CL_ALLOW_UNKNOWN_CL));
 
   do_test_pending();
 }
diff --git a/netwerk/test/unit/test_fallback_response-error_canceled.js b/netwerk/test/unit/test_fallback_response-error_canceled.js
index 8886e5fd3cf9..e025f29678f3 100644
--- a/netwerk/test/unit/test_fallback_response-error_canceled.js
+++ b/netwerk/test/unit/test_fallback_response-error_canceled.js
@@ -1,5 +1,7 @@
 Cu.import("resource://testing-common/httpd.js");
 Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/NetUtil.jsm");
+
 
 var httpServer = null;
 // Need to randomize, because apparently no one clears our cache
@@ -13,16 +15,7 @@ var cacheUpdateObserver = null;
 var systemPrincipal = Services.scriptSecurityManager.getSystemPrincipal();
 
 function make_channel(url, callback, ctx) {
-  var ios = Cc["@mozilla.org/network/io-service;1"].
-            getService(Ci.nsIIOService);
-  return ios.newChannel2(url,
-                         "",
-                         null,
-                         null,      // aLoadingNode
-                         systemPrincipal,
-                         null,      // aTriggeringPrincipal
-                         Ci.nsILoadInfo.SEC_NORMAL,
-                         Ci.nsIContentPolicy.TYPE_OTHER);
+  return NetUtil.newChannel({uri: url, loadUsingSystemPrincipal: true});
 }
 
 function make_uri(url) {
@@ -103,7 +96,7 @@ function run_test()
     chan.notificationCallbacks = new ChannelEventSink(ES_ABORT_REDIRECT);
     var chanac = chan.QueryInterface(Ci.nsIApplicationCacheChannel);
     chanac.chooseApplicationCache = true;
-    chan.asyncOpen(new ChannelListener(finish_test, null, CL_EXPECT_FAILURE), null);
+    chan.asyncOpen2(new ChannelListener(finish_test, null, CL_EXPECT_FAILURE));
   }}
 
   var os = Cc["@mozilla.org/observer-service;1"].
diff --git a/netwerk/test/unit/test_fallback_response-error_passing.js b/netwerk/test/unit/test_fallback_response-error_passing.js
index 43b198f429d9..e59fad7d09c5 100644
--- a/netwerk/test/unit/test_fallback_response-error_passing.js
+++ b/netwerk/test/unit/test_fallback_response-error_passing.js
@@ -1,5 +1,6 @@
 Cu.import("resource://testing-common/httpd.js");
 Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/NetUtil.jsm");
 
 var httpServer = null;
 // Need to randomize, because apparently no one clears our cache
@@ -13,16 +14,7 @@ var cacheUpdateObserver = null;
 var systemPrincipal = Services.scriptSecurityManager.getSystemPrincipal();
 
 function make_channel(url, callback, ctx) {
-  var ios = Cc["@mozilla.org/network/io-service;1"].
-            getService(Ci.nsIIOService);
-  return ios.newChannel2(url,
-                         "",
-                         null,
-                         null,      // aLoadingNode
-                         systemPrincipal,
-                         null,      // aTriggeringPrincipal
-                         Ci.nsILoadInfo.SEC_NORMAL,
-                         Ci.nsIContentPolicy.TYPE_OTHER);
+  return NetUtil.newChannel({uri: url, loadUsingSystemPrincipal: true});
 }
 
 function make_uri(url) {
@@ -102,7 +94,7 @@ function run_test()
     var chan = make_channel(randomURI);
     var chanac = chan.QueryInterface(Ci.nsIApplicationCacheChannel);
     chanac.chooseApplicationCache = true;
-    chan.asyncOpen(new ChannelListener(finish_test), null);
+    chan.asyncOpen2(new ChannelListener(finish_test));
   }}
 
   var os = Cc["@mozilla.org/observer-service;1"].
diff --git a/netwerk/test/unit/test_inhibit_caching.js b/netwerk/test/unit/test_inhibit_caching.js
index 5fa7c2972043..7e81eb69684c 100644
--- a/netwerk/test/unit/test_inhibit_caching.js
+++ b/netwerk/test/unit/test_inhibit_caching.js
@@ -1,6 +1,6 @@
 Cu.import('resource://gre/modules/LoadContextInfo.jsm');
 Cu.import("resource://testing-common/httpd.js");
-Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/NetUtil.jsm");
 
 var first = true;
 function contentHandler(metadata, response)
@@ -35,18 +35,8 @@ function run_test()
 
 // Makes a regular request
 function test_first_response() {
-  var ios = Cc["@mozilla.org/network/io-service;1"].
-            getService(Ci.nsIIOService);
-  var chan = ios.newChannel2(uri+"/test",
-                         "",
-                         null,
-                         null,      // aLoadingNode
-                         Services.scriptSecurityManager.getSystemPrincipal(),
-                         null,      // aTriggeringPrincipal
-                         Ci.nsILoadInfo.SEC_NORMAL,
-                         Ci.nsIContentPolicy.TYPE_OTHER);
-
-  chan.asyncOpen(new ChannelListener(check_first_response, null), null);
+  var chan = NetUtil.newChannel({uri: uri+"/test", loadUsingSystemPrincipal: true});
+  chan.asyncOpen2(new ChannelListener(check_first_response, null));
 }
 
 // Checks that we got the appropriate response
@@ -71,19 +61,9 @@ function cache_entry_callback(status, entry) {
 
 // Makes a request with the INHIBIT_CACHING load flag
 function test_inhibit_caching() {
-  var ios = Cc["@mozilla.org/network/io-service;1"].
-            getService(Ci.nsIIOService);
-  var chan = ios.newChannel2(uri+"/test",
-                         "",
-                         null,
-                         null,      // aLoadingNode
-                         Services.scriptSecurityManager.getSystemPrincipal(),
-                         null,      // aTriggeringPrincipal
-                         Ci.nsILoadInfo.SEC_NORMAL,
-                         Ci.nsIContentPolicy.TYPE_OTHER);
-
+  var chan = NetUtil.newChannel({uri: uri+"/test", loadUsingSystemPrincipal: true});
   chan.QueryInterface(Ci.nsIRequest).loadFlags |= Ci.nsIRequest.INHIBIT_CACHING;
-  chan.asyncOpen(new ChannelListener(check_second_response, null), null);
+  chan.asyncOpen2(new ChannelListener(check_second_response, null));
 }
 
 // Checks that we got a different response from the first request
diff --git a/netwerk/test/unit/test_invalidport.js b/netwerk/test/unit/test_invalidport.js
index 08aafbf7584f..70d401c84c54 100644
--- a/netwerk/test/unit/test_invalidport.js
+++ b/netwerk/test/unit/test_invalidport.js
@@ -2,7 +2,7 @@
 // Perform the async open several times in order to induce exponential
 // scheduling behavior bugs.
 
-Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/NetUtil.jsm");
 
 var CC = Components.Constructor;
 
@@ -31,17 +31,8 @@ function run_test() {
 }
 
 function execute_test() {
-  var ios = Cc["@mozilla.org/network/io-service;1"].
-                       getService(Ci.nsIIOService);
-  var chan = ios.newChannel2("http://localhost:75000",
-                             "",
-                             null,
-                             null,      // aLoadingNode
-                             Services.scriptSecurityManager.getSystemPrincipal(),
-                             null,      // aTriggeringPrincipal
-                             Ci.nsILoadInfo.SEC_NORMAL,
-                             Ci.nsIContentPolicy.TYPE_OTHER);
+  var chan = NetUtil.newChannel({uri: "http://localhost:75000", loadUsingSystemPrincipal: true});
   chan.QueryInterface(Ci.nsIHttpChannel);
-  chan.asyncOpen(listener, null);
+  chan.asyncOpen2(listener);
 }
 
diff --git a/netwerk/test/unit/test_multipart_streamconv_application_package.js b/netwerk/test/unit/test_multipart_streamconv_application_package.js
index ca7907159a31..9d9f0011bc3b 100644
--- a/netwerk/test/unit/test_multipart_streamconv_application_package.js
+++ b/netwerk/test/unit/test_multipart_streamconv_application_package.js
@@ -21,7 +21,7 @@
 //   - checks that the headers for each part is set correctly
 
 Cu.import("resource://testing-common/httpd.js");
-Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/NetUtil.jsm");
 
 var httpserver = null;
 
@@ -30,16 +30,7 @@ XPCOMUtils.defineLazyGetter(this, "uri", function() {
 });
 
 function make_channel(url) {
-  var ios = Cc["@mozilla.org/network/io-service;1"].
-            getService(Ci.nsIIOService);
-  return ios.newChannel2(url,
-                         "",
-                         null,
-                         null,      // aLoadingNode
-                         Services.scriptSecurityManager.getSystemPrincipal(),
-                         null,      // aTriggeringPrincipal
-                         Ci.nsILoadInfo.SEC_NORMAL,
-                         Ci.nsIContentPolicy.TYPE_OTHER);
+  return NetUtil.newChannel({uri: url, loadUsingSystemPrincipal: true});
 }
 
 function contentHandler(metadata, response)
@@ -210,7 +201,7 @@ function test_multipart() {
            null);
 
   var chan = make_channel(uri + "/multipart");
-  chan.asyncOpen(conv, null);
+  chan.asyncOpen2(conv);
 }
 
 function test_multipart_with_boundary() {
@@ -222,7 +213,7 @@ function test_multipart_with_boundary() {
            null);
 
   var chan = make_channel(uri + "/multipart2");
-  chan.asyncOpen(conv, null);
+  chan.asyncOpen2(conv);
 }
 
 function test_multipart_chunked_headers() {
@@ -234,7 +225,7 @@ function test_multipart_chunked_headers() {
            null);
 
   var chan = make_channel(uri + "/multipart3");
-  chan.asyncOpen(conv, null);
+  chan.asyncOpen2(conv);
 }
 
 function test_multipart_content_type_other() {
@@ -247,7 +238,7 @@ function test_multipart_content_type_other() {
            null);
 
   var chan = make_channel(uri + "/multipart4");
-  chan.asyncOpen(conv, null);
+  chan.asyncOpen2(conv);
 }
 
 function test_multipart_package_header(aChunkSize) {
@@ -260,7 +251,7 @@ function test_multipart_package_header(aChunkSize) {
            null);
 
   var chan = make_channel(uri + "/multipart5_" + aChunkSize);
-  chan.asyncOpen(conv, null);
+  chan.asyncOpen2(conv);
 }
 
 // Bug 1212223 - Test multipart with package header and different chunk size.
diff --git a/netwerk/test/unit/test_multipart_streamconv_missing_lead_boundary.js b/netwerk/test/unit/test_multipart_streamconv_missing_lead_boundary.js
index 46f46cab0703..97924ccb16ab 100644
--- a/netwerk/test/unit/test_multipart_streamconv_missing_lead_boundary.js
+++ b/netwerk/test/unit/test_multipart_streamconv_missing_lead_boundary.js
@@ -1,5 +1,5 @@
 Cu.import("resource://testing-common/httpd.js");
-Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/NetUtil.jsm");
 
 var httpserver = null;
 
@@ -8,33 +8,11 @@ XPCOMUtils.defineLazyGetter(this, "uri", function() {
 });
 
 function make_channel(url) {
-  var ios = Cc["@mozilla.org/network/io-service;1"].
-            getService(Ci.nsIIOService);
-  return ios.newChannel2(url,
-                         "",
-                         null,
-                         null,      // aLoadingNode
-                         Services.scriptSecurityManager.getSystemPrincipal(),
-                         null,      // aTriggeringPrincipal
-                         Ci.nsILoadInfo.SEC_NORMAL,
-                         Ci.nsIContentPolicy.TYPE_OTHER);
+  return NetUtil.newChannel({uri: url, loadUsingSystemPrincipal: true});
 }
 
 var multipartBody = "\r\nSome text\r\n--boundary\r\n\r\n<?xml version='1.0'?><root/>\r\n--boundary--";
 
-function make_channel(url) {
-  var ios = Cc["@mozilla.org/network/io-service;1"].
-            getService(Ci.nsIIOService);
-  return ios.newChannel2(url,
-                         "",
-                         null,
-                         null,      // aLoadingNode
-                         Services.scriptSecurityManager.getSystemPrincipal(),
-                         null,      // aTriggeringPrincipal
-                         Ci.nsILoadInfo.SEC_NORMAL,
-                         Ci.nsIContentPolicy.TYPE_OTHER);
-}
-
 function contentHandler(metadata, response)
 {
   response.setHeader("Content-Type", 'multipart/mixed; boundary="boundary"');
@@ -106,6 +84,6 @@ function run_test()
 					 null);
 
   var chan = make_channel(uri);
-  chan.asyncOpen(conv, null);
+  chan.asyncOpen2(conv);
   do_test_pending();
 }
diff --git a/netwerk/test/unit_ipc/child_app_offline.js b/netwerk/test/unit_ipc/child_app_offline.js
index a2c5e5003f59..ded06701bbcd 100644
--- a/netwerk/test/unit_ipc/child_app_offline.js
+++ b/netwerk/test/unit_ipc/child_app_offline.js
@@ -1,4 +1,4 @@
-Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/NetUtil.jsm");
 
 function inChildProcess() {
   return Cc["@mozilla.org/xre/app-info;1"]
@@ -7,15 +7,8 @@ function inChildProcess() {
 }
 
 function makeChan(url, appId, inBrowser) {
-  var ios = Cc["@mozilla.org/network/io-service;1"].getService(Ci.nsIIOService);
-  var chan = ios.newChannel2(url,
-                             null,
-                             null,
-                             null,      // aLoadingNode
-                             Services.scriptSecurityManager.getSystemPrincipal(),
-                             null,      // aTriggeringPrincipal
-                             Ci.nsILoadInfo.SEC_NORMAL,
-                             Ci.nsIContentPolicy.TYPE_OTHER).QueryInterface(Ci.nsIHttpChannel);
+  var chan = NetUtil.newChannel({uri: url, loadUsingSystemPrincipal: true})
+                    .QueryInterface(Ci.nsIHttpChannel);
   chan.notificationCallbacks = {
     appId: appId,
     isInBrowserElement: inBrowser,
@@ -37,28 +30,28 @@ function makeChan(url, appId, inBrowser) {
 function run_test() {
   do_test_pending();
   var chan = makeChan("http://localhost:12345/first", 14, false);
-  chan.asyncOpen(new ChannelListener(checkResponse, "response0"), null);
+  chan.asyncOpen2(new ChannelListener(checkResponse, "response0"));
 }
 
 // Should return cached result
 function test1() {
   do_test_pending();
   var chan = makeChan("http://localhost:12345/first", 14, false);
-  chan.asyncOpen(new ChannelListener(checkResponse, "response0"), null);
+  chan.asyncOpen2(new ChannelListener(checkResponse, "response0"));
 }
 
 // This request should fail
 function test2() {
   do_test_pending();
   var chan = makeChan("http://localhost:12345/second", 14, false);
-  chan.asyncOpen(new ChannelListener(checkResponse, "", CL_EXPECT_FAILURE), null);
+  chan.asyncOpen2(new ChannelListener(checkResponse, "", CL_EXPECT_FAILURE));
 }
 
 // This request should succeed
 function test3() {
   do_test_pending();
   var chan = makeChan("http://localhost:12345/second", 14, false);
-  chan.asyncOpen(new ChannelListener(checkResponse, "response3"), null);
+  chan.asyncOpen2(new ChannelListener(checkResponse, "response3"));
 }
 
 function checkResponse(req, buffer, expected) {