cros: HTML fixes needed to reinitializing an existing lock WebUI.

ui/login/account_picker/user_pod_row.css

 /* Copyright 2014 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 user pods row of account picker UI.
  */
 
 podrow {
   /* Temporarily disabled because animation interferes with updating screen's
    size. */
@@ skipping 36 matching lines @@
 .pod.flying-pin-pod {
   transition: height 180ms ease-in-out,
               top 180ms ease-in-out;
 }
 
 .pod.pin-enabled {
   height: 417px;
   top: -87px !important;
 }
 
+.disable-pin-animation .pod.pin-enabled {
+  transition: none;
+}
+
 .pod .pin-container {
   height: 204px;
   position: absolute;
   top: 170px;
 }
 
 .pod.faded {
   opacity: .75;
 }
 
@@ skipping 913 matching lines @@
   -webkit-animation: ellipsis-component2 1.5s infinite;
 }
 
 @-webkit-keyframes ellipsis-component2 {
   0% { opacity: 0; }
   25% { opacity: 0; }
   50% { opacity: 0; }
   75% { opacity: 1; }
   100% { opacity: 0; }
 }