Update thumbnail/list view buttons.

chrome/browser/resources/file_manager/css/file_manager.css

 /*
- * Copyright (c) 2011 The Chromium Authors. All rights reserved.
+ * 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.
  */
 
 /* Outer frame of the dialog. */
 body {
    -webkit-box-flex: 1;
    -webkit-box-orient: vertical;
    -webkit-transition: opacity 70ms linear;
    -webkit-user-select: none;
@@ skipping 310 matching lines @@
 }
 
 /* The > arrow between breadcrumbs. */
 .breadcrumb-spacer {
   -webkit-margin-start: 7px;
   -webkit-margin-end: 4px;
   color: #aaa;
   font-size: 12px;
 }
 
-button.detail-view > img,
-button.thumbnail-view > img {
-  position: relative;
-  top: 1px;
+.dialog-header > div > button {
+  -webkit-border-radius: 0;
+  border: none;
+  height: 28px;
+  min-width: 0;
+  padding: 0;
+  width: 28px;
+}
+
+/* button:hover and button[disabled]:hover rules must be override by placing
+ * the following four rules after them.
+ */
+button.detail-view {
+  background-image: url('../images/icon_list_view_off.png');
+}
+
+button.thumbnail-view {
+  background-image: url('../images/icon_thumb_view_off.png');
+}
+
+button.detail-view[disabled] {
+  background-image: url('../images/icon_list_view_on.png');
+}
+
+button.thumbnail-view[disabled] {
+  background-image: url('../images/icon_thumb_view_on.png');
 }
 
 .filelist-panel {
   display: -webkit-box;
   -webkit-box-orient: vertical;
   -webkit-box-flex: 1;
 }
 
 .list-container {
   display: -webkit-box;
@@ skipping 438 matching lines @@
 /* Overlay pane covering the entire file manager window (e.g. image editor)*/
 .overlay-pane {
   position: absolute;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
   border: none;
   z-index: 100;
 }