Implement automatically generated constructors for frog and dartium dart:html

client/dom/templates/html/frog/factoryprovider_SharedWorker.darttemplate

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// WARNING: Do not edit - generated code.
-
-interface AudioElement extends MediaElement {
+class $FACTORYPROVIDER {
+  factory SharedWorker(String scriptURL, [String name]) native
+'''
+if (name == null) return new SharedWorker(scriptURL);
+return new SharedWorker(scriptURL, name);
+''';
 }