part of fix for #46488 - http startup handlers get an Observe() call as well

r=valeski, sr=waterson

netwerk/protocol/http/public/nsIHTTPProtocolHandler.idl

@@ -175,4 +175,5 @@ interface nsIHTTPProtocolHandler : nsIProtocolHandler
 // HTTP protocol handler will do_GetService() each CID or Contractid that is registered
 // under this category when it comes alive.
 #define NS_HTTP_STARTUP_CATEGORY "http-startup-category"
+#define NS_HTTP_STARTUP_TOPIC (NS_LITERAL_STRING("http-startup").get())
 %}

netwerk/protocol/http/src/nsHTTPHandler.cpp

@@ -124,8 +124,8 @@ nsHTTPHandler::GetScheme(char * *o_Scheme)
  * @category: Input category
  * @return: returns error if any CID or ContractID registered failed to create.
  */
-static nsresult
-CategoryCreateService( const char *category )
+nsresult
+nsHTTPHandler::CategoryCreateService(const char *category)
 {
     nsresult rv = NS_OK;
 
@@ -173,6 +173,13 @@ CategoryCreateService( const char *category )
         {
             nFailed++;
         }
+
+        // try an observer, if it implements it.
+        nsCOMPtr<nsIObserver> observer = do_QueryInterface(instance, &rv);
+        if (NS_SUCCEEDED(rv) && observer)
+            observer->Observe(NS_STATIC_CAST(nsISupports*,NS_STATIC_CAST(void*,this)),
+                              NS_HTTP_STARTUP_TOPIC,
+                              NS_LITERAL_STRING("").get());
     }
     return (nFailed ? NS_ERROR_FAILURE : NS_OK);
 }

netwerk/protocol/http/src/nsHTTPHandler.h

@@ -200,6 +200,8 @@ private:
     
     PRUint32 getCapabilities (const char *host, PRInt32 port, PRUint32 cap);
     void     setCapabilities (nsIChannel* i_pTrans, PRUint32 aCapabilities);
+    nsresult CategoryCreateService(const char *category);
+    
     PRBool  mProxySSLConnectAllowed;
 };