Added simple functionality to remove interfaces from HTML lib.

sdk/lib/html/dart2js/html_dart2js.dart

 library html;
 
 import 'dart:collection';
 import 'dart:html_common';
 import 'dart:indexed_db';
 import 'dart:isolate';
 import 'dart:json';
 import 'dart:math';
 import 'dart:svg' as svg;
 import 'dart:web_audio' as web_audio;
@@ skipping 161 matching lines @@
   final String animationName;
 
   /// @domName WebKitAnimationEvent.elapsedTime; @docsEditable true
   final num elapsedTime;
 }
 // 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.
 
 
-/// @domName HTMLAppletElement; @docsEditable true
-class AppletElement extends Element native "*HTMLAppletElement" {
-
-  /// @domName HTMLAppletElement.align; @docsEditable true
-  String align;
-
-  /// @domName HTMLAppletElement.alt; @docsEditable true
-  String alt;
-
-  /// @domName HTMLAppletElement.archive; @docsEditable true
-  String archive;
-
-  /// @domName HTMLAppletElement.code; @docsEditable true
-  String code;
-
-  /// @domName HTMLAppletElement.codeBase; @docsEditable true
-  String codeBase;
-
-  /// @domName HTMLAppletElement.height; @docsEditable true
-  String height;
-
-  /// @domName HTMLAppletElement.hspace; @docsEditable true
-  String hspace;
-
-  /// @domName HTMLAppletElement.name; @docsEditable true
-  String name;
-
-  /// @domName HTMLAppletElement.object; @docsEditable true
-  String object;
-
-  /// @domName HTMLAppletElement.vspace; @docsEditable true
-  String vspace;
-
-  /// @domName HTMLAppletElement.width; @docsEditable true
-  String width;
-}
-// 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.
-
-
 /// @domName DOMApplicationCache; @docsEditable true
 class ApplicationCache extends EventTarget native "*DOMApplicationCache" {
 
   /// @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent; @docsEditable true
   ApplicationCacheEvents get on =>
     new ApplicationCacheEvents(this);
 
   static const int CHECKING = 2;
 
   static const int DOWNLOADING = 3;
@@ skipping 25308 matching lines @@
   T next() {
     if (!hasNext) {
       throw new StateError("No more elements");
     }
     return _array[_pos++];
   }
 
   final List<T> _array;
   int _pos;
 }