Use hi-resolution favicon variants if available.

chrome/browser/favicon/favicon_util.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 "chrome/browser/favicon/favicon_util.h"
 
 #include "chrome/common/icon_messages.h"
 #include "content/public/browser/render_view_host.h"
 #include "googleurl/src/gurl.h"
 
 // static
 int FaviconUtil::DownloadFavicon(content::RenderViewHost* rvh,
                                  const GURL& url,
-                                 int image_size) {
+                                 std::vector<int> image_sizes) {

[pkotwicz, 2012/08/02 23:47:08]

bitmap_sizes

   static int id = 0;
   rvh->Send(new IconMsg_DownloadFavicon(rvh->GetRoutingID(), ++id, url,
-            image_size));
+            image_sizes));
   return id;
 }