Mark i18n functions as native and set proper names

src/extensions/i18n/footer.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 20 matching lines @@
 // Intl namespace.
 
 // Fix RegExp global state so we don't fail WebKit layout test:
 // fast/js/regexp-caching.html
 // It seems that 'g' or test() operations leave state changed.
 var CLEANUP_RE = new RegExp('');
 CLEANUP_RE.test('');
 
 return Intl;
 }());
-
-// Alias v8Intl to Intl so we don't break existing applications.
-// TODO(cira): Remove in a couple of months (starting at Oct 1st 2012).
-var v8Intl = Intl;