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

chrome/browser/resources/options/chromeos/change_picture_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. */
 
 #user-images-area {
   display: -webkit-box;
 }
 
 #user-image-grid {
   -webkit-user-drag: none;
@@ skipping 40 matching lines @@
  * .camera: camera (live or photo) is selected;
  * .live: camera is in live mode (no photo taken yet/last photo removed). */
 
 #user-image-preview {
   margin: 18px 10px 0 0;
   max-width: 220px;
   position: relative;
 }
 
 #user-image-preview .perspective-box {
-  -webkit-perspective: 600px;
   border: solid 1px #cacaca;
   border-radius: 4px;
   padding: 3px;
+  perspective: 600px;
   width: 220px;
 }
 
 #user-image-preview-img {
   background: white;
   border: solid 1px #cacaca;
   border-radius: 4px;
   max-height: 220px;
   max-width: 220px;
   padding: 3px;
 }
 
 .camera.live #user-image-preview-img {
   display: none;
 }
 
 .camera.flip-x #user-image-preview-img {
-  -webkit-transform: rotateY(180deg);
+  transform: rotateY(180deg);
 }
 
 .user-image-stream-area {
   display: none;
   position: relative;
 }
 
 .camera.live .user-image-stream-area {
   display: block;
 }
 
 #user-image-stream-crop {
   height: 220px;
   overflow: hidden;
   position: relative;
   width: 220px;
 }
 
 .flip-x #user-image-stream-crop {
-  -webkit-transform: rotateY(180deg);
+  transform: rotateY(180deg);
 }
 
 /* TODO(ivankr): specify dimensions from real capture size. */
 .user-image-stream {
   border: solid 1px #cacaca;
   height: 220px;
   /* Center image for 4:3 aspect ratio. */
   left: -16.6%;
   position: absolute;
   visibility: hidden;
@@ skipping 55 matching lines @@
 }
 
 #user-image-attribution {
   -webkit-padding-start: 34px;
   line-height: 26px;
 }
 
 #user-image-author-website {
   -webkit-padding-start: 5px;
 }