Reduce usage of webkit CSS prefixes in chrome/browser/resources

chrome/browser/resources/options/supervised_user_import.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. */
 
 #supervised-user-import {
   width: 612px;
 }
 
 #supervised-user-import-text,
 #supervised-user-select-avatar-text {
@@ skipping 34 matching lines @@
 #supervised-user-list:focus {
   border-color: rgb(77, 144, 254);
 }
 
 #select-avatar-grid {
   background-color: rgba(255, 255, 255, 0.75);
   padding: 2px;
 }
 
 #supervised-user-import-error-bubble {
-  -webkit-transition: max-height 200ms, padding 200ms;
   background-color: rgb(238, 185, 57);
   border-radius: 4px;
   font-weight: bold;
   margin-left: auto;
   margin-right: auto;
   margin-top: 10px;
   max-height: 50px;
   overflow: hidden;
   padding: 1px 10px;
   text-align: center;
+  transition: max-height 200ms, padding 200ms;
   width: 80%;
 }
 
 #supervised-user-import-error-bubble[hidden] {
   max-height: 0;
 }
 
 .profile-img-disabled {
   opacity: 0.4;
 }
 
 .profile-name-disabled {
   color: rgb(153, 153, 153);
 }
 
 .already-on-this-device {
   padding-left: 20px;
   padding-right: 6px;
 }