Remove unnecessary cr.ui.TabPanel dependency from chrome://gpu.

There are no tabs anymore in this page, and the use of
cr.ui.TabPanel can simply be replaced by a plain div.

Bug: 1028829
Change-Id: If7121f011d27dd93a3f276708e468c99744d67f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2442498
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812733}

content/browser/resources/gpu/gpu_internals.html

@@ -27,19 +27,13 @@ body {
   top: 0;
 }
 
-tabbox tabpanels {
-  padding: 10px;
-}
-
 </style>
 <link rel="stylesheet" href="info_view.css">
-<link rel="stylesheet" href="chrome://resources/css/tabs.css">
 <link rel="stylesheet" href="chrome://resources/css/widgets.css">
 <script src="chrome://resources/js/cr.js"></script>
 <script src="chrome://resources/js/cr/event_target.js"></script>
 <script src="chrome://resources/js/cr/ui.js"></script>
 <script src="chrome://resources/js/cr/ui/focus_outline_manager.js"></script>
-<script src="chrome://resources/js/cr/ui/tabs.js"></script>
 <script src="chrome://resources/js/load_time_data.js"></script>
 <script src="chrome://resources/js/util.js"></script>
 <script src="chrome://resources/mojo/mojo/public/js/mojo_bindings_lite.js"></script>

content/browser/resources/gpu/info_view.html

@@ -3,7 +3,7 @@ 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.
 -->
-<tabpanel id="info-view">
+<div id="info-view">
   <div>
     <input type="button" id="copy-to-clipboard" value="Copy Report to Clipboard">
   </div>
@@ -132,4 +132,4 @@ found in the LICENSE file.
       </table>
     </div>
   </div>
-</tabpanel>
+</div>

content/browser/resources/gpu/info_view.js

@@ -12,16 +12,13 @@ cr.define('gpu', function() {
   /**
    * Provides information on the GPU process and underlying graphics hardware.
    * @constructor
-   * @extends {cr.ui.TabPanel}
    */
-  const InfoView = cr.ui.define(cr.ui.TabPanel);
+  const InfoView = cr.ui.define('div');
 
   InfoView.prototype = {
-    __proto__: cr.ui.TabPanel.prototype,
+    __proto__: HTMLDivElement.prototype,
 
     decorate: function() {
-      cr.ui.TabPanel.prototype.decorate.apply(this);
-
       browserBridge.addEventListener('gpuInfoUpdate', this.refresh.bind(this));
       browserBridge.addEventListener(
           'logMessagesChange', this.refresh.bind(this));