DevTools: Fix frontend compilation errors uncovered by r184188

Source/devtools/front_end/host/ToolboxHost.js

 // Copyright 2014 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.
 
 /**
  * @interface
  */
-WebInspector.ToolboxDelegate = function() {}
+WebInspector.ToolboxHost = function() {}
 
-WebInspector.ToolboxDelegate.prototype = {
+WebInspector.ToolboxHost.prototype = {
     /**
      * @param {!Element} rootElement
      */
     toolboxLoaded: function(rootElement) {},
 
     /**
      * @return {!InspectorFrontendHostAPI}
      */
     inspectorFrontendHost: function() {}
 }