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

Source/devtools/front_end/accessibility/AccessibilitySidebarView.js

 // Copyright 2015 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.
 
 /**
  * @constructor
  * @extends {WebInspector.ThrottledWidget}
  */
 WebInspector.AccessibilitySidebarView = function()
 {
@@ skipping 161 matching lines @@
     /**
      * @param {string} textContent
      * @param {string=} className
      * @return {!Element}
      */
     createInfo: function(textContent, className)
     {
         var classNameOrDefault = className || "info";
         var info = createElementWithClass("div", classNameOrDefault);
         info.textContent = textContent;
-        this.bodyElement.appendChild(info);
+        this.element.appendChild(info);
         return info;
     },
 
     /**
      * @param {string=} className
      * @return {!TreeOutline}
      */
     createTreeOutline: function(className)
     {
         var treeOutline = new TreeOutlineInShadow(className);
         treeOutline.registerRequiredCSS("accessibility/accessibilityNode.css");
         treeOutline.registerRequiredCSS("components/objectValue.css");
         treeOutline.element.classList.add("hidden");
-        this.bodyElement.appendChild(treeOutline.element);
+        this.element.appendChild(treeOutline.element);
         return treeOutline;
     },
 
     __proto__: WebInspector.SidebarPane.prototype
 }
 
 /**
  * @constructor
  * @extends {WebInspector.AccessibilitySubPane}
  */
 WebInspector.AXComputedTextSubPane = function()
 {
     WebInspector.AccessibilitySubPane.call(this, WebInspector.UIString("Computed Text"));
 
-    this._computedTextElement = this.bodyElement.createChild("div", "ax-computed-text hidden");
+    this._computedTextElement = this.element.createChild("div", "ax-computed-text hidden");
 
     this._noTextInfo = this.createInfo(WebInspector.UIString("No computed text"));
     this._noNodeInfo = this.createInfo(WebInspector.UIString("No accessibility node"));
     this._treeOutline = this.createTreeOutline();
 };
 
 
 WebInspector.AXComputedTextSubPane.prototype = {
     /**
      * @param {?AccessibilityAgent.AXNode} axNode
@@ skipping 459 matching lines @@
         reasonElement = WebInspector.formatLocalized("Static text node is used as name for ", [], "");
         break;
     case "uninteresting":
         reasonElement = WebInspector.formatLocalized("Element not interesting for accessibility.", [], "")
         break;
     }
     if (reasonElement)
         reasonElement.classList.add("ax-reason");
     return reasonElement;
 }