Remove webkit prefixes for CSS Animation in chrome/ styles

chrome/browser/resources/options/browser_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. */
 
 #change-home-page-section {
   -webkit-margin-start: 30px;
 }
 
 #home-page-url {
   display: inline-block;
@@ skipping 217 matching lines @@
   line-height: normal;
   white-space: normal;
   width: 25px;
 }
 
 .network-icon cr-network-icon {
   height: 100%;
   width: 100%;
 }
 
-@-webkit-keyframes connecting-animation {
+@keyframes connecting-animation {
   0% {
     background-position: 0 25%;
   }
   12.5% {
     background-position: 0 50%;
   }
   25%  {
     background-position: 0 75%;
   }
   37.5%  {
@@ skipping 33 matching lines @@
 
 .network-group > .controlled-setting-indicator,
 .network-menu-item > .controlled-setting-indicator {
   -webkit-margin-end: 5px;
 }
 
 .network-options-button:hover {
   opacity: 1;
 }
 
-@-webkit-keyframes vpn-connecting-animation {
+@keyframes vpn-connecting-animation {
   from {
     opacity: 1;
   }
   to {
     opacity: 0.2;
   }
 }
 
 .network-connecting {
-  -webkit-animation: connecting-animation 1s step-end infinite;
+  animation: connecting-animation 1s step-end infinite;
 }
 
 .network-vpn.network-connecting {
-  -webkit-animation: vpn-connecting-animation 500ms alternate infinite;
+  animation: vpn-connecting-animation 500ms alternate infinite;
 }
 
 .network-title {
   font-weight: 600;
   line-height: 120%;
 }
 
 .network-subtitle {
   color: #333;
   display: inline-block;
@@ skipping 166 matching lines @@
 
 /* An input that has no function except to take up the same amount of space as
  * a checkbox. */
 .spacer-checkbox {
   visibility: hidden;
 }
 
 #android-apps-settings {
   -webkit-margin-start: 30px;
 }