[Resources] Update the Google logo assets to the proper representations

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 18 matching lines @@
 body.fakebox-disable #fakebox {
   border-color: rgb(238, 238, 238);
   cursor: default;
 }
 
 body.fakebox-disable #fakebox > input {
   cursor: default;
 }
 
 #logo {
-  background-image: -webkit-image-set(
-      url('images/google_logo.png') 1x,
-      url('images/google_logo.png@2x') 2x);
+  background-image: url('images/google_logo.png@2x');
   background-repeat: no-repeat;
   background-size: 269px 95px;
   height: 95px;
   margin-bottom: 24px;
   margin-top: 157px;
   width: 269px;
 }
 
 body.alternate-logo #logo {
-  background-image: url(images/white_google_logo.png);
+  background-image: url('images/white_google_logo.png@2x');
 }
 
 #fakebox {
   /* Use GPU compositing if available. */
   -webkit-transform: translate3d(0, 0, 0);
   -webkit-transition: -webkit-transform 100ms linear, border-color 100ms linear;
   background-color: #fff;
   border: 1px solid rgb(185, 185, 185);
   border-radius: 1px;
   border-top-color: rgb(160, 160, 160);
@@ skipping 272 matching lines @@
   opacity: 0.9;
   padding: 3px;
   position: fixed;
   right: 8px;
 }
 
 body.rtl #attribution,body.rtl #recent-tabs {
   left: 8px;
   right: auto;
 }