[Webapp Refactor] Remove remoting.clientSession.

remoting/webapp/browser_test/browser_test.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
  *
  * Provides basic functionality for JavaScript based browser test.
  *
  * To define a browser test, create a class under the browserTest namespace.
@@ skipping 204 matching lines @@
  */
 browserTest.disconnect = function() {
   var AppMode = remoting.AppMode;
   var finishedMode = AppMode.CLIENT_SESSION_FINISHED_ME2ME;
   var finishedButton = 'client-finished-me2me-button';
   if (remoting.app.getConnectionMode() === remoting.Application.Mode.IT2ME) {
     finishedMode = AppMode.CLIENT_SESSION_FINISHED_IT2ME;
     finishedButton = 'client-finished-it2me-button';
   }
 
-  remoting.app.disconnect();
+  var activity = remoting.app.getActivity();
+  if (!activity) {
+    return Promise.resolve();
+  }
+
+  activity.stop();
 
   return browserTest.onUIMode(finishedMode).then(function() {
     browserTest.clickOnControl(finishedButton);
     return browserTest.onUIMode(AppMode.HOME);
   });
 };
 
 /**
  * @param {string} pin
  * @param {?boolean} opt_expectError
@@ skipping 193 matching lines @@
  */
 browserTest.ensureRemoteConnectionEnabled = function(pin) {
   browserTest.ensureHostStartedWithPIN(pin).then(function() {
     browserTest.pass();
   }, function(reason) {
     browserTest.fail(reason);
   });
 };
 
 browserTest.init();