Remove usage of [Client=..] from web_ui_mojo test.

content/test/data/web_ui_mojo.js

 // 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.
 
 define('main', [
     'mojo/public/js/connection',
     'content/test/data/web_ui_test_mojo_bindings.mojom',
     'content/public/renderer/service_provider',
 ], function (connection, bindings, serviceProvider) {
-  var retainedConnection;
-
-  function RendererTargetTest(bindings) {
-    this.bindings_ = bindings;
-  }
-
-  // TODO(aa): It is a bummer to need this stub object in JavaScript. We should
-  // have a 'client' object that contains both the sending and receiving bits of
-  // the client side of the interface. Since JS is loosely typed, we do not need
-  // a separate base class to inherit from to receive callbacks.
-  RendererTargetTest.prototype =
-      Object.create(bindings.RendererTarget.stubClass.prototype);
-
-  RendererTargetTest.prototype.ping = function () {
-    this.bindings_.pingResponse();
-  };
+  var browserTarget;
 
   return function() {
-    retainedConnection = new connection.Connection(
+    browserTarget = connection.bindProxyHandle(
         serviceProvider.connectToService(bindings.BrowserTarget.name),
-        RendererTargetTest,
-        bindings.BrowserTarget.proxyClass);
+        undefined,
+        bindings.BrowserTarget);
+
+    browserTarget.start().then(function() {
+      browserTarget.stop();
+    });
   };
 });