Implement automatically generated constructors for frog and dartium dart:html

client/html/generated/html/frog/_AudioElementFactoryProvider.dart

Index: client/html/generated/html/frog/_AudioElementFactoryProvider.dart
diff --git a/client/html/generated/html/interface/AudioElement.dart b/client/html/generated/html/frog/_AudioElementFactoryProvider.dart
similarity index 55%
copy from client/html/generated/html/interface/AudioElement.dart
copy to client/html/generated/html/frog/_AudioElementFactoryProvider.dart
index 42a2a861a2bd9563c017d6b0ab2cf33bcb0d6d3e..789133e02a4d692d3e587ff84428f45e79f59dec 100644
--- a/client/html/generated/html/interface/AudioElement.dart
+++ b/client/html/generated/html/frog/_AudioElementFactoryProvider.dart
@@ -2,7 +2,9 @@
 // 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 _AudioElementFactoryProvider {
+  factory AudioElement([String src = null]) native '''
+      if (src == null) return new Audio();
+      return new Audio(src);
+    ''';
 }