[FileBrowser] Fixed tab navigation for detail-thumbnail-settings buttons.

chrome/browser/resources/file_manager/css/file_manager.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.col-resize * {
   cursor: col-resize !important;
 }
 
 /* Outer frame of the dialog. */
 body {
@@ skipping 428 matching lines @@
 #search-box {
   background: url('../images/icon_search.png') no-repeat scroll 2px 1.5px;
   border: 1px solid #BBB;
   border-radius: 2px;
   display: -webkit-box;
   height: 20px;
   margin-right: 10px;
   padding-left: 22px;
 }
 
-/* button:hover and button[disabled]:hover rules must be override by placing
- * the following four rules after them.
- */
-div.detail-view {
-  background-image: url('../images/icon_list_view.png');
+/* When detail-view is not disabled (thus thumbnail view is disabled), push
+   it up a little, to make it's right glowing border visible while focused.*/
+button#detail-view:not([disabled]) {
+  z-index: 2;
 }
 
-div.thumbnail-view {
-  background-image: url('../images/icon_thumb_view.png');
-  margin-left: -1px;
-}
-
-
 button.settings {
   display: none;
   /* Temporary solution not to uglify settings button */
   height: 30px;
   margin-left: 8px;
   width: 57px;
 }
 
 [gdata] button.settings {
   background-image: url('../images/settings_button.png');
@@ skipping 839 matching lines @@
   left: 0;
   padding: 10px;
   position: absolute;
   right: 0;
   top: 28px;  /* Leave room for the file list header. */
 }
 
 .dialog-container:not([gdrive-welcome='page']) #no-search-results[show] {
   display: block;
 }