[DevTools] Add Toolbox page to undocked DevTools frontend.

Source/devtools/front_end/InspectorFrontendAPI.js

 /*
  * 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:
  *
  *     * 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 246 matching lines @@
         if (InspectorFrontendAPI._isLoaded) {
             command();
             return;
         }
         InspectorFrontendAPI._pendingCommands.push(command);
     }
 }
 
 /** @typedef {!Object.<{type: string, keyCode: (number|undefined), keyIdentifier: (string|undefined), modifiers: (number|undefined)}>} */
 InspectorFrontendAPI.ForwardedKeyboardEvent;
-
-if (top !== window) {
-    top.InspectorFrontendAPI = window.InspectorFrontendAPI;
-}