Dart: Refactor Stubs

benchmarks/mojo_rtt_benchmark/lib/echo_server.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.
 
 import 'dart:async';
 
 import 'package:mojo/application.dart';
 import 'package:mojo/bindings.dart';
 import 'package:mojo/core.dart';
 import 'package:_mojo_for_test_only/mojo/examples/echo.mojom.dart';
 
 class EchoImpl implements Echo {
   EchoStub _stub;
   EchoApplication _application;
 
   EchoImpl(this._application, MojoMessagePipeEndpoint endpoint) {
     _stub = new EchoStub.fromEndpoint(endpoint, this);
-    _stub.onError = _errorHandler;
+    _stub.ctrl.onError = _errorHandler;
   }
 
   echoString(String value, [Function responseFactory]) =>
       responseFactory(value);
 
   Future close() => _stub.close();
 
   _errorHandler(Object e) => _application.removeService(this);
 }
 
@@ skipping 36 matching lines @@
       await service.close();
     }
     MojoHandle.reportLeakedHandles();
   }
 }
 
 main(List args, Object handleToken) {
   MojoHandle appHandle = new MojoHandle(handleToken);
   new EchoApplication.fromHandle(appHandle);
 }