[New Tab Page] Local NTP: bound the size of favicon image.

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. */
 
 /* TODO: Need to discuss with NTP folks before we remove font-family from the
  * body tag. */
 body {
   background-attachment: fixed !important;
   background-color: white;
   cursor: default;
@@ skipping 576 matching lines @@
 }
 
 .thumb-ntp .mv-favicon-fallback {
   background-image: -webkit-image-set(
       url(images/ntp_default_favicon.png) 1x,
       url(images/ntp_default_favicon.png@2x) 2x);
   background-repeat: no-repeat;
   background-size: 16px 16px;
 }
 
+.mv-favicon img {
+  height: 100%;
+  width: 100%;
+}
+
 /* The notification shown when a tile is blacklisted. */
 #mv-notice {
   font-size: 12px;
   font-weight: bold;
   opacity: 1;
   padding: 10px 0;
 }
 
 .icon-ntp #mv-notice {
   margin-top: 30px;
@@ skipping 76 matching lines @@
   padding: 3px;
   position: fixed;
   right: 8px;
 }
 
 html[dir=rtl] #attribution,
 html[dir=rtl] #recent-tabs {
   left: 8px;
   right: auto;
 }