Issue 1985 - Replaced __proto__ with Object.create() and Object.getPrototypeOf()

ext/background.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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 (function()
 {
-  var nonEmptyPageMaps = {__proto__: null};
+  var nonEmptyPageMaps = Object.create(null);
   var pageMapCounter = 0;
 
   var PageMap = ext.PageMap = function()
   {
     this._map = Object.create(null);
     this._id = ++pageMapCounter;
   };
   PageMap.prototype = {
     _delete: function(id)
     {
@@ skipping 29 matching lines @@
       this._delete(page._id);
     }
   };
 
   ext._removeFromAllPageMaps = function(pageId)
   {
     for (var pageMapId in nonEmptyPageMaps)
       nonEmptyPageMaps[pageMapId]._delete(pageId);
   };
 })();