Issue 189 - Implement API changes from #117, #153, #192 in libadblockplus

lib/utils.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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 31 matching lines @@
   {
     return Services.io.newURI(url);
   },
 
   checkLocalePrefixMatch: function(prefixes)
   {
     if (!prefixes)
       return null;
 
     let list = prefixes.split(",");
-    for each (let prefix in list)
+    for (let prefix of list)
       if (new RegExp("^" + prefix + "\\b").test(this.appLocale))
         return prefix;
 
     return null;
   },
 
   chooseFilterSubscription: function(subscriptions)
   {
     let selectedItem = null;
     let selectedPrefix = null;
@@ skipping 23 matching lines @@
           // probability 1/N (N being the number of matches).
           if (Math.random() * matchCount < 1)
           {
             selectedItem = subscription;
             selectedPrefix = prefix;
           }
         }
       }
     }
     return selectedItem;
+  },
+
+  yield: function()
+  {
   }
 };