Added JS-based XMLHttpRequest implementation

lib/compat.js

 /*
  * This file is part of the Adblock Plus extension,
  * Copyright (C) 2006-2012 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/>.
  */
 
 // TODO: These need to be defined properly
 var window = this;
-function requestFileSystem() {};
 
 //
 // Module framework stuff
 //
 
 function require(module)
 {
   return require.scopes[module];
 }
 require.scopes = {__proto__: null};
@@ skipping 369 matching lines @@
     notificationCallbacks: {},
     loadFlags: 0,
     INHIBIT_CACHING: 0,
     VALIDATE_ALWAYS: 0,
     QueryInterface: function()
     {
       return this;
     }
   }
 };