Don't request missing favicon on every page request.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 43ec8e581e47467e292228b338ab5123f4179980..eedb050c859f02c49e5d7fd6aa3b2a3f3b930f6b 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -2403,6 +2403,7 @@ void WebContentsImpl::OnBrowserPluginMessage(const IPC::Message& message) {
 
 void WebContentsImpl::OnDidDownloadImage(
     int id,
+    int http_status_code,
     const GURL& image_url,
     int requested_size,
     const std::vector<SkBitmap>& bitmaps) {
@@ -2413,7 +2414,7 @@ void WebContentsImpl::OnDidDownloadImage(
     return;
   }
   if (!iter->second.is_null()) {
-    iter->second.Run(id, image_url, requested_size, bitmaps);
+    iter->second.Run(id, http_status_code, image_url, requested_size, bitmaps);
   }
   image_download_map_.erase(id);
 }