Don't request missing favicon on every page request.

content/renderer/image_loading_helper.cc

Index: content/renderer/image_loading_helper.cc
diff --git a/content/renderer/image_loading_helper.cc b/content/renderer/image_loading_helper.cc
index ff6e2bd82923d823d15fb8d95f1be458e54e9b0c..b3a54be9d952b6d1dfa09494802ea34d13215aab 100644
--- a/content/renderer/image_loading_helper.cc
+++ b/content/renderer/image_loading_helper.cc
@@ -54,6 +54,7 @@ void ImageLoadingHelper::OnDownloadImage(int id,
 
   Send(new ImageHostMsg_DidDownloadImage(routing_id(),
                                          id,
+                                         0,
                                          image_url,
                                          image_size,
                                          result_images));
@@ -85,6 +86,7 @@ void ImageLoadingHelper::DidDownloadImage(
   // Notify requester of image download status.
   Send(new ImageHostMsg_DidDownloadImage(routing_id(),
                                          fetcher->id(),
+                                         fetcher->http_status_code(),
                                          fetcher->image_url(),
                                          requested_size,
                                          images));