- Change "static final" to "static const" in the lib/ directory.

lib/html/src/Isolates.dart

 // 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.
 
 _serialize(var message) {
   return new _JsSerializer().traverse(message);
 }
 
 class JsProxy {
   SendPortSync _port;
@@ skipping 158 matching lines @@
 }
 
 /// End of object proxy implementation.
 
 _deserialize(var message) {
   return new _JsDeserializer().deserialize(message);
 }
 
 class _JsDeserializer extends _Deserializer {
 
-  static final _UNSPECIFIED = const Object();
+  static const _UNSPECIFIED = const Object();
 
   deserializeSendPort(List x) {
     String tag = x[1];
     switch (tag) {
       case 'nativejs':
         num id = x[2];
         return new _JsSendPortSync(id);
       case 'dart':
         num isolateId = x[2];
         num portId = x[3];
@@ skipping 178 matching lines @@
   }
 }
 
 get _isolateId => ReceivePortSync._isolateId;
 
 void _dispatchEvent(String receiver, var message) {
   var event = document.$dom_createEvent('TextEvent');
   event.initTextEvent(receiver, false, false, window, JSON.stringify(message));
   window.$dom_dispatchEvent(event);
 }