Chrome OS: Add 'Cancel" icon in 'Add an account' screen in multiprofile mode.

chrome/browser/resources/chromeos/login/header_bar.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. */
 
 #login-header-bar {
   -webkit-padding-start: 15px;
   bottom: 0;
   left: 0;
   padding-bottom: 6px;
   position: absolute;
@@ skipping 130 matching lines @@
       url(images/2x/more-settings.svg) 2x );
 }
 
 #login-header-bar #guest-user-button-text {
   background-image: -webkit-image-set(
       url(images/1x/browse-as-guest.svg) 1x,
       url(images/2x/browse-as-guest.svg) 2x );
 }
 
 #login-header-bar #cancel-multiple-sign-in-button-text {
-  /* TODO(dzhioev): replace with appropriate image when possible. */
-  background-image: url(chrome://theme/IDR_PANEL_CLOSE);
+    background-image: -webkit-image-set(
+      url(images/1x/cancel.svg) 1x,
+      url(images/2x/cancel.svg) 2x );
 }
 
 #login-header-bar #sign-out-user-button-text {
   background-image: -webkit-image-set(
       url(images/1x/signout.svg) 1x,
       url(images/2x/signout.svg) 2x );
 }
 
 .button-restricted {
   border: 1px solid transparent;
   color: white !important;
   opacity: 0.4 !important;
 }