Use hi-resolution favicon variants if available.

chrome/browser/favicon/favicon_handler.h

 // 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.
 
 #ifndef CHROME_BROWSER_FAVICON_FAVICON_HANDLER_H_
 #define CHROME_BROWSER_FAVICON_FAVICON_HANDLER_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 111 matching lines @@
 
  protected:
   // These virtual methods make FaviconHandler testable and are overridden by
   // TestFaviconHandler.
 
   // Return the NavigationEntry for the active entry, or NULL if the active
   // entries URL does not match that of the URL last passed to FetchFavicon.
   virtual content::NavigationEntry* GetEntry();
 
   // Asks the render to download favicon, returns the request id.
-  virtual int DownloadFavicon(const GURL& image_url, int image_size);
+  virtual int DownloadFavicon(const GURL& image_url, const std::vector<int>& image_size);
 
   // Ask the favicon from history
   virtual void UpdateFaviconMappingAndFetch(
       const GURL& page_url,
       const GURL& icon_url,
       history::IconType icon_type,
       CancelableRequestConsumerBase* consumer,
       const FaviconService::FaviconDataCallback& callback);
 
   virtual void GetFavicon(
@@ skipping 149 matching lines @@
   // This handler's delegate.
   FaviconHandlerDelegate* delegate_;  // weak
 
   // Current favicon candidate.
   FaviconCandidate favicon_candidate_;
 
   DISALLOW_COPY_AND_ASSIGN(FaviconHandler);
 };
 
 #endif  // CHROME_BROWSER_FAVICON_FAVICON_HANDLER_H_