Don't request missing favicon on every page request.

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
@@ skipping 2385 matching lines @@
   // a BrowserPlugin prior to this will be ignored.
   // For more info, see comment above classes BrowserPluginEmbedder and
   // BrowserPluginGuest.
   CHECK(!browser_plugin_embedder_.get());
   browser_plugin_embedder_.reset(BrowserPluginEmbedder::Create(this));
   browser_plugin_embedder_->OnMessageReceived(message);
 }
 
 void WebContentsImpl::OnDidDownloadImage(
     int id,
+    int http_status_code,
     const GURL& image_url,
     int requested_size,
     const std::vector<SkBitmap>& bitmaps) {
   ImageDownloadMap::iterator iter = image_download_map_.find(id);
   if (iter == image_download_map_.end()) {
     // Currently WebContents notifies us of ANY downloads so that it is
     // possible to get here.
     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);
 }
 
 void WebContentsImpl::OnUpdateFaviconURL(
     int32 page_id,
     const std::vector<FaviconURL>& candidates) {
   FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                     DidUpdateFaviconURL(page_id, candidates));
 }
@@ skipping 1030 matching lines @@
 }
 
 BrowserPluginGuestManager*
     WebContentsImpl::GetBrowserPluginGuestManager() const {
   return static_cast<BrowserPluginGuestManager*>(
       GetBrowserContext()->GetUserData(
           browser_plugin::kBrowserPluginGuestManagerKeyName));
 }
 
 }  // namespace content