Removing interfaces from dart:html

lib/html/templates/html/interface/interface_HttpRequest.darttemplate

 // Copyright (c) 2011, 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.
 
 $!COMMENT
-interface $ID$EXTENDS {
-  $ID.get(String url, onSuccess($ID request));
+abstract class $ID$EXTENDS {
+  factory $ID.get(String url, onSuccess($ID request)) =>
+      _$(ID)FactoryProvider.create$(ID)_get(url, onSuccess);
 
-  $ID.getWithCredentials(String url, onSuccess($ID request));
+  factory $ID.getWithCredentials(String url, onSuccess($ID request)) =>
+      _$(ID)FactoryProvider.create$(ID)getWithCredentials(url, onSuccess);
 $!MEMBERS}