Remove webkit prefixes for transform and perspective in ui/ styles

ui/webui/resources/css/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. */
 
 /* The shield that overlays the background. */
 .overlay {
   -webkit-box-align: center;
   -webkit-box-orient: vertical;
   -webkit-box-pack: center;
-  /* TODO(dbeam): remove perspective when http://crbug.com/374970 is fixed. */
-  -webkit-perspective: 1px;
   -webkit-transition: 200ms opacity;
   background-color: rgba(255, 255, 255, 0.75);
   bottom: 0;
   display: -webkit-box;
   left: 0;
   overflow: auto;
   padding: 20px;
+  /* TODO(dbeam): remove perspective when http://crbug.com/374970 is fixed. */
+  perspective: 1px;
   position: fixed;
   right: 0;
   top: 0;
 }
 
 /* Used to slide in the overlay. */
 .overlay.transparent .page {
   /* TODO(flackr): Add perspective(500px) rotateX(5deg) when accelerated
    * compositing is enabled on chrome:// pages. See http://crbug.com/116800. */
   transform: scale(0.99) translateY(-20px);
@@ skipping 167 matching lines @@
 #overlay-container-1 {
   z-index: 11;
 }
 #overlay-container-2 {
   z-index: 12;
 }
 
 .transparent {
   opacity: 0;
 }