cros: Update SAML flow.

chrome/browser/resources/chromeos/login/screen_gaia_signin.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.
  */
 
 #gaia-signin {
   height: 609px; /* Should be the same as #user-image.loading min-heigth. */
   padding: 70px 17px 69px;    /* Screen has no controls. */
   width: 722px; /* Should be the same as #user-image.loading width. */
 }
@@ skipping 51 matching lines @@
 #gaia-signin-form-container,
 #signin-frame {
   height: 100%;
 }
 
 .saml #gaia-signin-form-container,
 .saml #signin-frame {
   width: 100%;
 }
 
-#gaia-signin-divider {
+.signin-divider {
   background: -webkit-gradient(
                    linear, left top, left bottom,
                    color-stop(0, #e3e3e3),
                    color-stop(0.5, #cacaca),
                    color-stop(1, #e3e3e3));
   border: none;
   width: 1px;
 }
 
 .no-right-panel #gaia-signin-divider,
@@ skipping 68 matching lines @@
   left: 0;
   position: absolute;
   right: 0;
   text-align: center;
   top: 50px;
 }
 
 #saml-notice-message {
   margin: 0 auto;
 }