Remove -webkit-*-before/after in:

chrome/browser/resources/chromeos/login/accessibility_menu.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.
  */
 
 #accessibility-menu {
-  -webkit-padding-after: 25px;
-  -webkit-padding-before: 15px;
   -webkit-padding-end: 80px;
   -webkit-padding-start: 25px;
+  padding-bottom: 25px;
+  padding-top: 15px;
 }
 
 .checkboxrow {
-  -webkit-margin-before: 10px;
   display: -webkit-box;
+  margin-top: 10px;
 }
 
 .checkboxlabel {
   -webkit-margin-start: 10px;
 }
 
 .close-button {
   background: url('chrome://theme/IDR_CLOSE_DIALOG') center no-repeat;
   height: 14px;
   position: absolute;
   right: 7px;
   top: 7px;
   width: 14px;
 }
 
 .close-button:hover {
   background-image: url('chrome://theme/IDR_CLOSE_DIALOG_H');
 }
 
 .close-button:active {
   background-image: url('chrome://theme/IDR_CLOSE_DIALOG_P');
 }
 
 html[dir=rtl] .close-button {
   left: 10px;
   right: auto;
 }