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

chrome/browser/resources/options/chromeos/display_options.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. */
 
 #display-options-page {
   background-color: rgb(240, 240, 240);
 }
 
 #display-options-content-area {
   padding: 0;
@@ skipping 13 matching lines @@
   -webkit-padding-end: 0;
   -webkit-padding-start: 15px;
   border-top: 1px solid lightgrey;
   padding-top: 15px;
 }
 
 /* The arrow at the border #display-configurations to point the focused display.
  * This is achieved by a square rotated by 45-deg, and it has border at the
  * upper-half, which were left/top before the rotation. */
 #display-configuration-arrow {
-  -webkit-transform: rotate(45deg);
   border-left: 1px solid lightgrey;
   border-top: 1px solid lightgrey;
   height: 20px;
   position: absolute;
+  transform: rotate(45deg);
   width: 20px;
   z-index: 1;
 }
 
 #display-configurations,
 #display-configuration-arrow,
 #display-options-page .action-area {
   background-color: white;
 }
 
@@ skipping 64 matching lines @@
   margin-right: 5px;
 }
 
 .display-options-button {
   width: 140px;
 }
 
 .display-options-button2 {
   width: 120px;
 }