Don't request missing favicon on every page request.

android_webview/browser/icon_helper.cc

 // 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.
 
 #include "android_webview/browser/icon_helper.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 12 matching lines @@
 }
 
 IconHelper::~IconHelper() {
 }
 
 void IconHelper::SetListener(Listener* listener) {
   listener_ = listener;
 }
 
 void IconHelper::DownloadFaviconCallback(
-  int id, const GURL& image_url, int requested_size,
+  int id, int http_status_code, const GURL& image_url, int requested_size,
   const std::vector<SkBitmap>& bitmaps) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (bitmaps.size() == 0) {
     return;
   }
 
   // We can protentially have multiple frames of the icon
   // in different sizes. We need more fine grain API spec
   // to let clients pick out the frame they want.
 
@@ skipping 33 matching lines @@
         // Silently ignore it. Only trigger a callback on valid icons.
         break;
       default:
         NOTREACHED();
         break;
     }
   }
 }
 
 }  // namespace android_webview