Don't request missing favicon on every page request.

android_webview/browser/icon_helper.h

 // Copyright (c) 2013 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.
 
 #ifndef ANDROID_WEBVIEW_BROWSER_ICON_HELPER_H_
 #define ANDROID_WEBVIEW_BROWSER_ICON_HELPER_H_
 
 #include <string>
 #include "content/public/browser/web_contents_observer.h"
 
@@ skipping 19 matching lines @@
 
   explicit IconHelper(content::WebContents* web_contents);
   virtual ~IconHelper();
 
   void SetListener(Listener* listener);
 
   // From WebContentsObserver
   virtual void DidUpdateFaviconURL(int32 page_id,
       const std::vector<content::FaviconURL>& candidates) OVERRIDE;
 
-  void DownloadFaviconCallback(int id, const GURL& image_url,
-      int requested_size, const std::vector<SkBitmap>& bitmaps);
+  void DownloadFaviconCallback(int id, int http_status_code,
+      const GURL& image_url, int requested_size,
+      const std::vector<SkBitmap>& bitmaps);
 
  private:
   Listener* listener_;
 
   DISALLOW_COPY_AND_ASSIGN(IconHelper);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_ICON_HELPER_H_