Fix a couple of scroll-related issues:

remoting/webapp/window_frame.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
  * Apps v2 custom title bar implementation
  */
 
 'use strict';
@@ skipping 92 matching lines @@
 
 /**
  * @param {remoting.ClientSession} clientSession The client session, or null if
  *     there is no connection.
  */
 remoting.WindowFrame.prototype.setClientSession = function(clientSession) {
   this.optionsMenu_.setClientSession(clientSession);
   this.clientSession_ = clientSession;
   var windowTitle = document.head.querySelector('title');
   if (this.clientSession_) {
-    document.body.classList.add('connected');
     this.title_.innerText = clientSession.getHostDisplayName();
     windowTitle.innerText = clientSession.getHostDisplayName() + ' - ' +
         chrome.i18n.getMessage(/*i18n-content*/'PRODUCT_NAME');
   } else {
-    document.body.classList.remove('connected');
     this.title_.innerHTML = ' ';
     windowTitle.innerText =
         chrome.i18n.getMessage(/*i18n-content*/'PRODUCT_NAME');
   }
   this.updateMaximizeOrRestoreIconTitle_();
 };
 
 /**
  * @return {{width: number, height: number}} The size of the window, ignoring
  *     the title-bar and window borders, if visible.
@@ skipping 112 matching lines @@
   var hidePreview = function() {
     target.classList.remove('preview');
   };
   target.classList.add('preview');
   window.setTimeout(hidePreview, kPreviewTimeoutMs);
 };
 
 
 /** @type {remoting.WindowFrame} */
 remoting.windowFrame = null;