Change web_ui testing code to avoid using JS router/proxyClass directly.

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/router',
+    'mojo/public/js/bindings',
     'content/test/data/web_ui_test_mojo_bindings.mojom',
     'content/public/renderer/frame_interfaces',
-], function (router, bindings, interfaceProvider) {
+], function (bindings, webUITest, interfaceProvider) {
   var browserTarget;
 
   return function() {
-    browserTarget = new bindings.BrowserTarget.proxyClass(
-        new router.Router(
-            interfaceProvider.getInterface(bindings.BrowserTarget.name)));
+    browserTarget = new webUITest.BrowserTargetPtr(
+        interfaceProvider.getInterface(webUITest.BrowserTarget.name));
 
     browserTarget.start().then(function() {
       browserTarget.stop();
     });
   };
 });