[cros] Fix error bubble fading on new OOBE.

chrome/browser/resources/chromeos/login/oobe.css

 /* 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.
  *
  * This is the stylesheet used by the Out of the box experience (OOBE) flow,
  * sign in and lock screens.
  */
 
 html,
 body {
@@ skipping 318 matching lines @@
 }
 
 /* Have to add attribute selector here otherwise style html[oobe=old] .step
    has more points. */
 html[oobe=old] .faded,
 html[oobe=old] .left,
 html[oobe=old] .right {
   opacity: 0;
 }
 
-html[oobe=new] .step.faded,
-html[oobe=new] .step.left,
-html[oobe=new] .step.right {
+html[oobe=new] .faded,
+html[oobe=new] .left,
+html[oobe=new] .right {
   opacity: 0;
 }
 
 html[oobe=new] .step.right {
   -webkit-transform: translateX(50px);
 }
 
 html[oobe=new] .step.left {
   -webkit-transform: translateX(-50px)
 }
@@ skipping 970 matching lines @@
   width: 100%;
 }
 
 .background-initial {
   opacity: 0;
 }
 
 .background-final {
   opacity: 1;
 }