Dart: Adjusts class Application for removal of Application/Shell Client=

services/dart/test/echo.dart

 #!mojo mojo:dart_content_handler
 
 // 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 'dart:mojo_application';
 import 'dart:mojo_bindings';
 import 'dart:mojo_core';
@@ skipping 17 matching lines @@
 }
 
 class EchoApplication extends Application {
   EchoApplication.fromHandle(MojoHandle handle) : super.fromHandle(handle);
 
   Function stubFactoryClosure() =>
       (endpoint) => new EchoServiceImpl(this, endpoint);
 }
 
 main(List args) {
-  MojoHandle shellHandle = new MojoHandle(args[0]);
+  MojoHandle appHandle = new MojoHandle(args[0]);
   String url = args[1];
-  var echoApplication = new EchoApplication.fromHandle(shellHandle);
+  var echoApplication = new EchoApplication.fromHandle(appHandle);
   echoApplication.listen();
 }