Inconsistent use of [x] close panel icon. Code changes.

chrome/browser/resources/ntp4/new_tab.css

 /* 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. */
 
 html {
   /* It's necessary to put this here instead of in body in order to get the
      background-size of 100% to work properly */
   height: 100%;
   overflow: hidden;
 }
@@ skipping 62 matching lines @@
 #notification .close-button {
   -webkit-margin-start: 8px;  /* Matching value in TilePage#repositionTile_. */
   vertical-align: top;
 }
 
 .close-button {
   background: no-repeat;
   background-color: transparent;
   /* TODO(estade): this should animate between states. */
   background-image: -webkit-image-set(
-      url('../../../../ui/resources/default_100_percent/close_bar.png') 1x,
-      url('../../../../ui/resources/default_200_percent/close_bar.png') 2x);
+      url('../../../../ui/resources/default_100_percent/close_2.png') 1x,
+      url('../../../../ui/resources/default_200_percent/close_2.png') 2x);
   border: 0;
   cursor: default;
   display: inline-block;
   height: 16px;
   padding: 0;
   width: 16px;
 }
 
 .close-button:hover,
 .close-button:focus {
   background-image: -webkit-image-set(
-      url('../../../../ui/resources/default_100_percent/close_bar_hover.png')
-          1x,
-      url('../../../../ui/resources/default_200_percent/close_bar_hover.png')
-          2x);
+      url('../../../../ui/resources/default_100_percent/close_2_hover.png') 1x,
+      url('../../../../ui/resources/default_200_percent/close_2_hover.png') 2x);
 }
 
 .close-button:active {
   background-image: -webkit-image-set(
-      url('../../../../ui/resources/default_100_percent/close_bar_pressed.png')
+      url('../../../../ui/resources/default_100_percent/close_2_pressed.png')
           1x,
-      url('../../../../ui/resources/default_200_percent/close_bar_pressed.png')
+      url('../../../../ui/resources/default_200_percent/close_2_pressed.png')
           2x);
 }
 
 .link-button {
   -webkit-margin-start: 0.5em;
 }
 
 #card-slider-frame {
   /* Must match #footer height. */
   bottom: 50px;
@@ skipping 353 matching lines @@
   padding: 0;
 }
 
 .other-sessions-promo-message:only-child {
   display: block;
 }
 
 .other-sessions-promo-message p {
   margin: 0;
 }