Dart: Refactors Proxies

mojo/dart/apptests/dart_apptests/lib/src/connect_to_loader_apptests.dart

 // Copyright 2015 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.
 
 library connectToLoader_apptests;
 
 import 'dart:async';
 
 import 'package:mojo_apptest/apptest.dart';
 import 'package:mojo_services/mojo/url_response_disk_cache.mojom.dart';
 import 'package:mojo/mojo/url_response.mojom.dart';
 import 'package:mojo/application.dart';
 import 'package:mojo/bindings.dart';
 import 'package:mojo/core.dart';
 
 connectToLoaderApptests(Application application, String url) {
   test('Connection', () async {
     var diskCacheProxy = new UrlResponseDiskCacheProxy.unbound();
     application.connectToService(
         "mojo:url_response_disk_cache", diskCacheProxy);
     var response = new UrlResponse();
     response.url = 'http://www.example.com';
-    await diskCacheProxy.ptr.updateAndGet(response);
+    await diskCacheProxy.updateAndGet(response);
     await diskCacheProxy.close();
   });
 }