Issue 2066 - Get rid of non-standard __defineGetter__, __defineSetter__, and __lookupGetter__

lib/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 53 matching lines @@
     }
 
     if (runAsyncQueue)
       runAsyncQueue.push(callback);
     else
       window.setTimeout(callback, 0);
   },
   get appLocale()
   {
     var locale = ext.i18n.getMessage("@@ui_locale").replace(/_/g, "-");
-    this.__defineGetter__("appLocale", function() {return locale});
+    Object.defineProperty(this, "appLocale", {value: locale, enumerable: true});
     return this.appLocale;
   },
   generateChecksum: function(lines)
   {
     // We cannot calculate MD5 checksums yet :-(
     return null;
   },
   makeURI: function(url)
   {
     return Services.io.newURI(url);
@@ skipping 55 matching lines @@
   {
     var Prefs = require("prefs").Prefs;
     var docLink = Prefs.documentation_link;
     return docLink.replace(/%LINK%/g, linkID).replace(/%LANG%/g, Utils.appLocale);
   },
 
   yield: function()
   {
   }
 };