Made small refactoring of OobeUI.

chrome/browser/resources/chromeos/login/header_bar.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 Login UI header bar implementation.
  */
 
 cr.define('login', function() {
   /**
@@ skipping 26 matching lines @@
       $('cancel-add-user-button').addEventListener('click',
           this.handleCancelAddUserClick_);
       $('guest-user-header-bar-item').addEventListener('click',
           this.handleGuestClick_);
       $('guest-user-button').addEventListener('click',
           this.handleGuestClick_);
       $('sign-out-user-button').addEventListener('click',
           this.handleSignoutClick_);
       $('cancel-multiple-sign-in-button').addEventListener('click',
           this.handleCancelMultipleSignInClick_);
-      if (document.documentElement.getAttribute('screen') == 'login')
+      if (Oobe.getInstance().displayType == DISPLAY_TYPE.LOGIN)
         login.AppsMenuButton.decorate($('show-apps-button'));
     },
 
     /**
      * Tab index value for all button elements.
      * @type {number}
      */
     set buttonsTabIndex(tabIndex) {
       var buttons = this.getElementsByTagName('button');
       for (var i = 0, button; button = buttons[i]; ++i) {
@@ skipping 122 matching lines @@
      * @private
      */
     updateUI_: function() {
       var gaiaIsActive = (this.signinUIState_ == SIGNIN_UI_STATE.GAIA_SIGNIN);
       var accountPickerIsActive =
           (this.signinUIState_ == SIGNIN_UI_STATE.ACCOUNT_PICKER);
       var managedUserCreationDialogIsActive =
           (this.signinUIState_ == SIGNIN_UI_STATE.MANAGED_USER_CREATION_FLOW);
       var wrongHWIDWarningIsActive =
           (this.signinUIState_ == SIGNIN_UI_STATE.WRONG_HWID_WARNING);
-      var isMultiProfilesUI = Oobe.getInstance().isSignInToAddScreen();
+      var isMultiProfilesUI =
+          (Oobe.getInstance().displayType == DISPLAY_TYPE.USER_ADDING);
 
       $('add-user-button').hidden = !accountPickerIsActive || isMultiProfilesUI;
       $('cancel-add-user-button').hidden = accountPickerIsActive ||
           !this.allowCancel_ ||
           wrongHWIDWarningIsActive ||
           isMultiProfilesUI;
       $('guest-user-header-bar-item').hidden = gaiaIsActive ||
           managedUserCreationDialogIsActive ||
           !this.showGuest_ ||
           wrongHWIDWarningIsActive ||
@@ skipping 45 matching lines @@
    * Convenience wrapper of animateIn.
    */
   HeaderBar.animateIn = function() {
     $('login-header-bar').animateIn();
   }
 
   return {
     HeaderBar: HeaderBar
   };
 });