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

Source/devtools/front_end/sources/ScopeChainSidebarPane.js

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2011 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 28 matching lines @@
 }
 
 WebInspector.ScopeChainSidebarPane._pathSymbol = Symbol("path");
 
 WebInspector.ScopeChainSidebarPane.prototype = {
     /**
      * @param {?WebInspector.DebuggerModel.CallFrame} callFrame
      */
     update: function(callFrame)
     {
-        this.bodyElement.removeChildren();
+        this.element.removeChildren();
 
         if (!callFrame) {
             var infoElement = createElement("div");
             infoElement.className = "info";
             infoElement.textContent = WebInspector.UIString("Not Paused");
-            this.bodyElement.appendChild(infoElement);
+            this.element.appendChild(infoElement);
             return;
         }
 
         for (var i = 0; i < this._sections.length; ++i) {
             var section = this._sections[i];
             if (!section.title)
                 continue;
             if (section.expanded)
                 this._expandedSections.add(section.title);
             else
@@ skipping 65 matching lines @@
             section.addEventListener(TreeOutline.Events.ElementExpanded, this._elementExpanded, this);
             section.addEventListener(TreeOutline.Events.ElementCollapsed, this._elementCollapsed, this);
 
             if (scope.type() === DebuggerAgent.ScopeType.Global)
                 section.objectTreeElement().collapse();
             else if (!foundLocalScope || scope.type() === DebuggerAgent.ScopeType.Local || this._expandedSections.has(title))
                 section.objectTreeElement().expand();
 
             section.element.classList.add("scope-chain-sidebar-pane-section");
             this._sections.push(section);
-            this.bodyElement.appendChild(section.element);
+            this.element.appendChild(section.element);
         }
     },
 
     /**
      * @param {!WebInspector.Event} event
      */
     _elementAttached: function(event)
     {
         var element = /** @type {!WebInspector.ObjectPropertyTreeElement} */ (event.data);
         if (element.isExpandable() && this._expandedProperties.has(this._propertyPath(element)))
@@ skipping 22 matching lines @@
      * @param {!WebInspector.ObjectPropertyTreeElement} treeElement
      * @return {string}
      */
     _propertyPath: function(treeElement)
     {
         return treeElement.treeOutline[WebInspector.ScopeChainSidebarPane._pathSymbol] + WebInspector.ObjectPropertyTreeElement.prototype.propertyPath.call(treeElement);
     },
 
     __proto__: WebInspector.SidebarPane.prototype
 }