ntp4: Most Visited appearance refresh

chrome/browser/resources/ntp4/new_tab.css

 /* Copyright (c) 2011 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 {
   font-family: segoe ui, arial, helvetica, sans-serif;
   font-size: 14px;
   /* It's necessary to put this here instead of in body in order to get the
      background-size of 100% to work properly */
@@ skipping 36 matching lines @@
   display: inline-block;
   opacity: 0;
   -webkit-transition-duration: 0.2s;
 }
 
 #notification > div > div,
 #notification > div {
   display: inline-block;
 }
 
-#notification button {
+#notification .close-button {
+  vertical-align: middle;
+  -webkit-margin-start: 0.5em;
+}
+
+.close-button {
   background: no-repeat;
   background-color: transparent;
   /* TODO(estade): this should animate between states. */
   background-image: url('chrome://theme/IDR_CLOSE_BAR');
   border: 0;
+  cursor: default;
   display: inline-block;
   height: 16px;
   padding: 0;
-  vertical-align: middle;
   width: 16px;
-  -webkit-margin-start: 0.5em;
 }
 
-#notification button:hover,
-#notification button:focus {
+.close-button:hover,
+.close-button:focus {
   background-image: url('chrome://theme/IDR_CLOSE_BAR_H');
 }
 
-#notification button:active {
+.close-button:active {
   background-image: url('chrome://theme/IDR_CLOSE_BAR_P');
 }
 
 .linkButton {
   color: #06C;
   cursor: pointer;
   display: inline-block;
   text-decoration: underline;
   -webkit-margin-start: 0.5em;
 }
@@ skipping 105 matching lines @@
   min-width: 26px;
   opacity: 0.3;
   top: 0;
   z-index: 5;
   -webkit-transition: width 150ms, right 150ms, background-color 150ms;
 }
 
 .page-switcher:hover {
   background-color: rgba(0, 0, 0, 0.2);
 }