DevTools: migrate sidebar pane's titleElement to use Toolbar.

Source/devtools/front_end/extensions/ExtensionPanel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 233 matching lines @@
     setPage: function(url)
     {
         if (this._objectPropertiesView) {
             this._objectPropertiesView.detach();
             delete this._objectPropertiesView;
         }
         if (this._extensionView)
             this._extensionView.detach(true);
 
         this._extensionView = new WebInspector.ExtensionView(this._server, this._id, url, "extension fill");
-        this._extensionView.show(this.bodyElement);
+        this._extensionView.show(this.element);
 
-        if (!this.bodyElement.style.height)
+        if (!this.element.style.height)
             this.setHeight("150px");
     },
 
     /**
      * @param {string} height
      */
     setHeight: function(height)
     {
-        this.bodyElement.style.height = height;
+        this.element.style.height = height;
     },
 
     /**
      * @param {string} title
      * @param {function(?string=)} callback
      * @param {?Protocol.Error} error
      * @param {?WebInspector.RemoteObject} result
      * @param {boolean=} wasThrown
      */
     _onEvaluate: function(title, callback, error, result, wasThrown)
     {
         if (error)
             callback(error.toString());
         else
             this._setObject(/** @type {!WebInspector.RemoteObject} */ (result), title, callback);
     },
 
     _createObjectPropertiesView: function()
     {
         if (this._objectPropertiesView)
             return;
         if (this._extensionView) {
             this._extensionView.detach(true);
             delete this._extensionView;
         }
         this._objectPropertiesView = new WebInspector.ExtensionNotifierView(this._server, this._id);
-        this._objectPropertiesView.show(this.bodyElement);
+        this._objectPropertiesView.show(this.element);
     },
 
     /**
      * @param {!WebInspector.RemoteObject} object
      * @param {string} title
      * @param {function(?string=)} callback
      */
     _setObject: function(object, title, callback)
     {
         // This may only happen if setPage() was called while we were evaluating the expression.
         if (!this._objectPropertiesView) {
             callback("operation cancelled");
             return;
         }
         this._objectPropertiesView.element.removeChildren();
         var section = new WebInspector.ObjectPropertiesSection(object, title);
         if (!title)
             section.titleLessMode();
         section.expand();
         section.editable = false;
         this._objectPropertiesView.element.appendChild(section.element);
         callback();
     },
 
     __proto__: WebInspector.SidebarPane.prototype
 }