Fix null pointer error.

remoting/webapp/me2mom/client_screen.js

 // Copyright (c) 2011 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
  * Functions related to the 'client screen' for Chromoting.
  */
 
 'use strict';
@@ skipping 104 matching lines @@
   remoting.clientSession.updateDimensions();
 }
 
 /**
  * Update the remoting client layout in response to a resize event.
  *
  * @return {void} Nothing.
  */
 remoting.onResize = function() {
   if (remoting.clientSession)
-    remoting.clientSession.onWindowSizeChanged();
-  remoting.toolbar.center();
+    remoting.clientSession.onResize();
 }
 
 /**
  * Disconnect the remoting client.
  *
  * @return {void} Nothing.
  */
 remoting.disconnect = function() {
   if (remoting.clientSession) {
     remoting.clientSession.disconnect();
@@ skipping 302 matching lines @@
   var createPluginAndConnect = function(token) {
     remoting.clientSession.createPluginAndConnect(
         document.getElementById('session-mode'),
         token);
   };
 
   remoting.oauth2.callWithToken(createPluginAndConnect);
 }
 
 }());