Gets dart working with new Application::AcceptConnection param

services/dart/test/echo/main.dart

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import 'dart:async';
 import 'mojo:application';
 import 'mojo:bindings';
 import 'mojo:core';
 
 import 'package:services/dart/test/echo_service.mojom.dart';
@@ skipping 14 matching lines @@
       _stub.close();
       _application.close();
     }
     return new Future.value(responseFactory(value));
   }
 }
 
 class EchoApplication extends Application {
   EchoApplication.fromHandle(MojoHandle handle) : super.fromHandle(handle);
 
-  void acceptConnection(String requestorUrl, ApplicationConnection connection) {
+  @override
+  void acceptConnection(String requestorUrl, String resolvedUrl,
+                        ApplicationConnection connection) {
     connection.provideService(EchoServiceName, (endpoint) =>
         new EchoServiceImpl(this, endpoint));
     connection.listen();
   }
 }
 
 main(List args) {
   MojoHandle appHandle = new MojoHandle(args[0]);
   String url = args[1];
   new EchoApplication.fromHandle(appHandle);
 }