Add support for favicon scale factor in WebUI

chrome/browser/resources/ntp4/most_visited_page.js

 // 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.
 
 cr.define('ntp', function() {
   'use strict';
 
   var TilePage = ntp.TilePage;
 
   /**
@@ skipping 76 matching lines @@
           this.reset();
         return;
       }
 
       var id = tileID++;
       this.id = 'most-visited-tile-' + id;
       this.data_ = data;
       this.classList.add('focusable');
 
       var faviconDiv = this.querySelector('.favicon');
-      var faviconUrl = 'chrome://favicon/size/16/' + data.url;
+      var faviconUrl = getFaviconURL(data.url);
       faviconDiv.style.backgroundImage = url(faviconUrl);
       chrome.send('getFaviconDominantColor', [faviconUrl, this.id]);
 
       var title = this.querySelector('.title');
       title.textContent = data.title;
       title.dir = data.direction;
 
       // Sets the tooltip.
       this.title = data.title;
 
@@ skipping 354 matching lines @@
     return oldData;
   };
 
   return {
     MostVisitedPage: MostVisitedPage,
     refreshData: refreshData,
   };
 });
 
 document.addEventListener('ntpLoaded', ntp.MostVisitedPage.onLoaded);