Issue 3208 - Send Private Browsing flag separately from the frame structure

lib/child/utils.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 33 matching lines @@
   }
   return frames;
 };
 
 /**
  * Checks whether Private Browsing mode is enabled for a content window.
  * @return {Boolean}
  */
 let isPrivate = exports.isPrivate = function(/**Window*/ window)
 {
-  return PrivateBrowsingUtils.isWindowPrivate(window);
+  return PrivateBrowsingUtils.isContentWindowPrivate(window);
 };