Remove webkit prefixes for CSS Animation 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;
   -webkit-transition: 200ms opacity;
@@ skipping 32 matching lines @@
   z-index: 0;
 }
 
 /* If the options page is loading don't do the transition. */
 .loading .overlay,
 .loading .overlay .page {
   -webkit-transition-duration: 0ms !important;
 }
 
 /* keyframes used to pulse the overlay */
-@-webkit-keyframes pulse {
+@keyframes pulse {
  0% {
    transform: scale(1);
  }
  40% {
    transform: scale(1.02);
   }
  60% {
    transform: scale(1.02);
   }
  100% {
    transform: scale(1);
  }
 }
 
 .overlay .page.pulse {
-  -webkit-animation-duration: 180ms;
-  -webkit-animation-iteration-count: 1;
-  -webkit-animation-name: pulse;
-  -webkit-animation-timing-function: ease-in-out;
+  animation-duration: 180ms;
+  animation-iteration-count: 1;
+  animation-name: pulse;
+  animation-timing-function: ease-in-out;
 }
 
 .overlay .page > .close-button {
   background-image: url(chrome://theme/IDR_CLOSE_DIALOG);
   background-position: center;
   background-repeat: no-repeat;
   height: 14px;
   position: absolute;
   right: 7px;
   top: 7px;
@@ skipping 113 matching lines @@
 #overlay-container-1 {
   z-index: 11;
 }
 #overlay-container-2 {
   z-index: 12;
 }
 
 .transparent {
   opacity: 0;
 }