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

Source/devtools/front_end/audits/AuditResultView.js

 /*
  * Copyright (C) 2009 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 44 matching lines @@
  * @constructor
  * @extends {WebInspector.SidebarPane}
  * @param {!WebInspector.AuditCategoryResult} categoryResult
  */
 WebInspector.AuditCategoryResultPane = function(categoryResult)
 {
     WebInspector.SidebarPane.call(this, categoryResult.title);
     this._treeOutline = new TreeOutlineInShadow();
     this._treeOutline.registerRequiredCSS("audits/auditResultTree.css");
     this._treeOutline.element.classList.add("audit-result-tree");
-    this.bodyElement.appendChild(this._treeOutline.element);
+    this.element.appendChild(this._treeOutline.element);
     this._treeOutline.expandTreeElementsWhenArrowing = true;
 
     function ruleSorter(a, b)
     {
         var result = WebInspector.AuditRule.SeverityOrder[a.severity || 0] - WebInspector.AuditRule.SeverityOrder[b.severity || 0];
         if (!result)
             result = (a.value || "").localeCompare(b.value || "");
         return result;
     }
 
@@ skipping 47 matching lines @@
         if (result.expanded) {
             treeElement.listItemElement.classList.remove("parent");
             treeElement.listItemElement.classList.add("parent-expanded");
             treeElement.expand();
         }
         return treeElement;
     },
 
     __proto__: WebInspector.SidebarPane.prototype
 }