Handle host need upgrade in Pin browser test

remoting/webapp/browser_test/cancel_pin_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
  * @suppress {checkTypes}
  * Browser test for the scenario below:
  * 1. Attempt to connect.
  * 2. Hit cancel at the PIN prompt.
  * 3. Reconnect with the PIN.
  * 4. Verify that the session is connected.
  */
 
 'use strict';
 
 /** @constructor */
 browserTest.Cancel_PIN = function() {};
 
 browserTest.Cancel_PIN.prototype.run = function(data) {
   browserTest.expect(typeof data.pin == 'string');
 
   var AppMode = remoting.AppMode;
-  browserTest.clickOnControl('this-host-connect');
-  browserTest.onUIMode(AppMode.CLIENT_PIN_PROMPT).then(function() {
+  browserTest.connectMe2Me().then(function() {
     browserTest.clickOnControl('cancel-pin-entry-button');
     return browserTest.onUIMode(AppMode.HOME);
   }).then(function() {
-    browserTest.clickOnControl('this-host-connect');
-    return browserTest.onUIMode(AppMode.CLIENT_PIN_PROMPT);
+    return browserTest.connectMe2Me()
   }).then(
     this.enterPin_.bind(this, data.pin)
   ).then(function() {
     // On fulfilled.
     browserTest.pass();
   }, function(reason) {
     // On rejected.
     browserTest.fail(reason);
   });
 };
 
 browserTest.Cancel_PIN.prototype.enterPin_ = function(pin) {
   document.getElementById('pin-entry').value = pin;
   browserTest.clickOnControl('pin-connect-button');
   return browserTest.expectMe2MeConnected();
 };