Supporting high dpi favicons in Instant Extended.

chrome/browser/resources/local_ntp/local_ntp.css

 /* Copyright 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. */
 body {
   background-attachment: fixed !important;
   background-color: white;
   cursor: default;
   font-family: arial, sans-serif;
   font-size: small;
   margin: 0;
@@ skipping 265 matching lines @@
   left: 2px;
   right: auto;
 }
 
 .mv-page-ready:hover .mv-x {
   -webkit-transition-delay: 500ms;
   opacity: 1;
 }
 
 .mv-favicon {
+  background-size: 16px;
   bottom: -8px;
   height: 16px;
   left: 61px;
   pointer-events: none;
   position: absolute;
   width: 16px;
 }
 
 /* The notification shown when a tile is blacklisted. */
 #mv-notice {
@@ skipping 45 matching lines @@
   font-size: 13px;
   position: absolute;
   right: 13px;
   text-align: left;
   z-index: -1;
 }
 
 #attribution img {
   display: block;
 }