Improve accessibility of user image selection screen.

chrome/browser/resources/options2/autofill_edit_overlay.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. */
 
 #autofill-edit-address-overlay {
   min-width: 510px;
 }
 
 #autofill-edit-credit-card-overlay {
   min-width: 500px;
@@ skipping 73 matching lines @@
 }
 
 #autofill-edit-address-overlay list#full-name-list input {
   width: 141px;
 }
 
 #autofill-edit-address-overlay list#full-name-list {
   width: 100%;
 }
 
-#full-name-list div[role='listitem'] > div {
+#full-name-list div[role='option'] > div {
   -webkit-box-orient: horizontal;
   display: -webkit-box;
 }
 
-#full-name-list div[role='listitem'] > div > div {
+#full-name-list div[role='option'] > div > div {
   -webkit-box-flex: 1;
 }