Refactor sinon helper to make it easier to use.

remoting/webapp/unittests/apps_v2_migration_unittest.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.
 
 /**
  * @fileoverview
  * @suppress {checkTypes|checkVars|reportUnknownTypes|visibility}
  */
 
 (function() {
@@ skipping 41 matching lines @@
 
   mockIsAppsV2.returns(false);
   if (v1HasHosts) {
     remoting.AppsV2Migration.saveUserInfo();
   }
 }
 
 module('AppsV2Migration', {
   setup: function() {
     chromeMocks.activate(['storage']);
-    mockIsAppsV2 = sinon.$setupStub(base, 'isAppsV2');
+    mockIsAppsV2 = sinon.stub(base, 'isAppsV2');
     remoting.identity = new remoting.Identity();
   },
   teardown: function() {
     chromeMocks.restore();
     mockIsAppsV2.restore();
     remoting.identity = null;
   }
 });
 
 QUnit.asyncTest(
@@ skipping 37 matching lines @@
 QUnit.asyncTest(
   'saveUserInfo() should clear the preferences on v2',
   function() {
     setMigrationData_('v1userName', 'v1user@gmail.com', true);
     mockIsAppsV2.returns(true);
     remoting.AppsV2Migration.saveUserInfo();
     remoting.AppsV2Migration.hasHostsInV1App().then(fail, pass);
 });
 
 })();