Bug 403180 - Executing test_378216.js hits an assertion due to not shutting down an HTTP server before finishing. r=Mossop, a=test-only change

toolkit/mozapps/extensions/test/unit/test_bug378216.js

@@ -65,6 +65,7 @@
  */
 
 do_import_script("netwerk/test/httpserver/httpd.js");
+var server;
 
 // This allows the EM to attempt to display errors to the user without failing
 var promptService = {
@@ -123,6 +124,7 @@ onUpdateStarted: function()
 
 onUpdateEnded: function()
 {
+  server.stop();
   do_test_finished();
 },