Add a script to generate HTML and DOM docs with cross-links to one another.

client/html/src/MessageEventWrappingImplementation.dart

 // 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.
 
 class MessageEventWrappingImplementation extends EventWrappingImplementation implements MessageEvent {
   MessageEventWrappingImplementation._wrap(ptr) : super._wrap(ptr);
 
   factory MessageEventWrappingImplementation(String type, String data,
       String origin, String lastEventId, Window source, MessagePort port,
       [bool canBubble = true, bool cancelable = true]) {
     final e = dom.document.createEvent("MessageEvent");
     e.initMessageEvent(type, canBubble, cancelable, data, origin, lastEventId,
         LevelDom.unwrap(source), LevelDom.unwrap(port));
     return LevelDom.wrapMessageEvent(e);
   }
 
   String get data() => _ptr.data;
 
   String get lastEventId() => _ptr.lastEventId;
 
   MessagePort get messagePort() => LevelDom.wrapMessagePort(_ptr.messagePort);
 
   String get origin() => _ptr.origin;
 
   Window get source() => LevelDom.wrapWindow(_ptr.source);
-
-  void initMessageEvent(String typeArg, bool canBubbleArg, bool cancelableArg, String dataArg, String originArg, String lastEventIdArg, Window sourceArg, MessagePort messagePort) {
-    _ptr.initMessageEvent(typeArg, canBubbleArg, cancelableArg, dataArg, originArg, lastEventIdArg, LevelDom.unwrap(sourceArg), LevelDom.unwrap(messagePort));
-    return;
-  }
 }