Fix scroll-related issues.

remoting/webapp/ui_mode.js

 // Copyright (c) 2012 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 controlling the modal UI state of the app. UI states
  * are expressed as HTML attributes with a dotted hierarchy. For example, the
  * string 'host.shared' will match any elements with an associated attribute
  * of 'host' or 'host.shared', showing those elements and hiding all others.
@@ skipping 121 matching lines @@
     }
   } else {
     document.addEventListener('keydown', remoting.ConnectionStats.onKeydown,
                               false);
     document.removeEventListener('visibilitychange',
                                  remoting.onVisibilityChanged, false);
     document.removeEventListener('webkitvisibilitychange',
                                  remoting.onVisibilityChanged, false);
     // TODO(jamiewalch): crbug.com/252796: Remove this once crbug.com/240772
     // is fixed.
-    var htmlNode = /** @type {HTMLElement} */ (document.body.parentNode);
-    htmlNode.classList.remove('no-horizontal-scroll');
-    htmlNode.classList.remove('no-vertical-scroll');
+    var scroller = document.getElementById('scroller');
+    scroller.classList.remove('no-horizontal-scroll');
+    scroller.classList.remove('no-vertical-scroll');
   }
 
   remoting.testEvents.raiseEvent(remoting.testEvents.Names.uiModeChanged, mode);
 };
 
 /**
  * Get the major mode that the app is running in.
  * @return {string} The app's current major mode.
  */
 remoting.getMajorMode = function() {
@@ skipping 123 matching lines @@
 }
 
 /**
  * @param {string} tag
  */
 remoting.showSetupProcessingMessage = function(tag) {
   var messageDiv = document.getElementById('host-setup-processing-message');
   l10n.localizeElementFromTag(messageDiv, tag);
   remoting.setMode(remoting.AppMode.HOST_SETUP_PROCESSING);
 }