Remove dangling chrome://theme/IDR_CLOSE_BAR* references

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

 /* Copyright (c) 2011 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 {
   -webkit-box-align: center;
   -webkit-box-pack: center;
@@ skipping 164 matching lines @@
   right: auto;
 }
 
 .capslock-on .pod.focused input[type='password']:not([hidden]) ~ .capslock-hint {
   visibility: visible;
 }
 
 .remove-user-button {
   -webkit-transition: width 100ms ease-in-out, background 200ms ease-in-out;
   -webkit-box-shadow: none;
-  background: url('chrome://theme/IDR_CLOSE_BAR') center center no-repeat;
+  background: url('../../../../../ui/resources/close_bar.png') center center no-repeat;
   border: 0;
   height: 16px;
   margin: 0;
   min-width: 16px;
   padding: 0;
   position: absolute;
   right: 14px;
   top: 14px;
   width: 16px;
 }
 
 .remove-user-button:hover {
   -webkit-box-shadow: none;
-  background: url('chrome://theme/IDR_CLOSE_BAR_H') center center no-repeat;
+  background: url('../../../../../ui/resources/close_bar_h.png') center center no-repeat;
 }
 
 .remove-user-button.active {
   background-color: #e94949;
   background-image: none;
   border-radius: 4px;
   color: white;
   font-size: 10px;
   height: initial;
   padding: 2px 4px;
@@ skipping 10 matching lines @@
   position: absolute;
   /* Width of .user-image. */
   width: 160px;
   z-index: 1;
 }
 
 .pod.focused .signed-in-indicator {
   /* Track shifting of .user-image on pod focus. */
   -webkit-transform: translateY(-1px);
 }