[DevTools] Drop "ui" module from toolbox.

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