Bug 1264768 - Dispatch error event when image loads for URLs that fail to resolve, r=hsivonen

--HG--
extra : rebase_source : 109914a4204a4dcf2f21e861da269e5bb476acf0

dom/base/nsImageLoadingContent.cpp

@@ -748,10 +748,15 @@ nsImageLoadingContent::LoadImage(const nsAString& aNewURI,
     return NS_OK;
   }
 
+  // Second, parse the URI string to get image URI
   nsCOMPtr<nsIURI> imageURI;
   nsresult rv = StringToURI(aNewURI, doc, getter_AddRefs(imageURI));
-  NS_ENSURE_SUCCESS(rv, rv);
-  // XXXbiesi fire onerror if that failed?
+  if (NS_FAILED(rv)) {
+    // Cancel image requests and fire error event per spec
+    CancelImageRequests(aNotify);
+    FireEvent(NS_LITERAL_STRING("error"));
+    return NS_OK;
+  }
 
   bool equal;