Fix Chrome logo to transition smoothly between the demo login screen and login spinner.

chrome/browser/resources/chromeos/login/demo_user_login.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 Demo login UI.
  */
 
 /**
  * Handles a user clicking anywhere on the screen. This will log the demo user
@@ skipping 20 matching lines @@
   });
 };
 
 /**
  * Show the login spinner.
  */
 showLoginSpinner = function() {
   // We're already logging in - don't login on click.
   document.removeEventListener('click', onClick);
 
-  // Hide the "Click to start" assets.
-  $('logo').hidden = true;
+  // Hide the "Click to start" and show the spinner.
   $('demo-login-text').hidden = true;
-
-  // Show the "Logging in" assets.
-  $('logo-login').hidden = false;
   $('login-spinner').hidden = false;
 };
 
 disableTextSelectAndDrag();
 document.addEventListener('DOMContentLoaded', initialize);