Make the externally connectable browser test clobber all of the builtins,

chrome/renderer/resources/extensions/platform_app.js

 // Copyright (c) 2012 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.
 
 /**
  * Returns a function that throws a 'not available' exception when called.
  *
  * @param {string} messagePrefix text to prepend to the exception message.
  */
 function generateDisabledMethodStub(messagePrefix, opt_messageSuffix) {
@@ skipping 116 matching lines @@
 // Disable onunload, onbeforeunload.
 Window.prototype.__defineSetter__(
     'onbeforeunload', generateDisabledMethodStub('onbeforeunload'));
 Window.prototype.__defineSetter__(
     'onunload', generateDisabledMethodStub('onunload'));
 var windowAddEventListener = Window.prototype.addEventListener;
 Window.prototype.addEventListener = function(type) {
   if (type === 'unload' || type === 'beforeunload')
     generateDisabledMethodStub(type)();
   else
-    return windowAddEventListener.apply(window, arguments);
+    return $Function.apply(windowAddEventListener, window, arguments);
 };