Implement automatically generated constructors for frog and dartium dart:html

client/html/generated/html/dartium/_DOMURLFactoryProvider.dart

Index: client/html/generated/html/dartium/_DOMURLFactoryProvider.dart
diff --git a/client/html/generated/html/interface/DOMURL.dart b/client/html/generated/html/dartium/_DOMURLFactoryProvider.dart
similarity index 72%
copy from client/html/generated/html/interface/DOMURL.dart
copy to client/html/generated/html/dartium/_DOMURLFactoryProvider.dart
index 6744630cbc6a256ddc357ff222d2059d2ef38e02..714b8c1c398df29173c31a283a00e4f699afa595 100644
--- a/client/html/generated/html/interface/DOMURL.dart
+++ b/client/html/generated/html/dartium/_DOMURLFactoryProvider.dart
@@ -2,7 +2,7 @@
 // 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 DOMURL {
+class _DOMURLFactoryProvider {
+  factory DOMURL() =>
+      _wrap(new dom.DOMURL());
 }