[DevTools] Add Toolbox page to undocked DevTools frontend.

Source/devtools/front_end/InspectorFrontendHostStub.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
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     },
 
     /**
      * @param {string} eventType
      */
     unsubscribe: function(eventType)
     {
     }
 }
 
-// Inherit bindings from the embedder.
-if (top !== window) {
-    window.InspectorFrontendHost = top.InspectorFrontendHost;
-}
-
 if (!window.InspectorFrontendHost) {
     InspectorFrontendHost = new WebInspector.InspectorFrontendHostStub();
 } else {
     var proto = WebInspector.InspectorFrontendHostStub.prototype;
     for (var name in proto) {
         var value = proto[name];
         if (typeof value !== "function" || InspectorFrontendHost[name])
             continue;
         InspectorFrontendHost[name] = function(name) {
             var message = "Incompatible embedder: method InspectorFrontendHost." + name + " is missing. Using stub instead.";
             WebInspector.messageSink.addErrorMessage(message, true);
             var args = Array.prototype.slice.call(arguments, 1);
             return proto[name].apply(InspectorFrontendHost, args);
         }.bind(null, name);
     }
 }