Remove webkit prefixes for CSS Animation in ui/ styles

ui/file_manager/gallery/css/gallery.css

 /* Copyright (c) 2014 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. */
 
 body {
   background-color: black;
   font-size: 84%;
   margin: 0;
   user-select: none;
 }
@@ skipping 33 matching lines @@
   margin: 0 -5px 0 0;
   left: auto;
   right: 24px;
 }
 
 .bubble .pointer:not(.bottom) {
   top: -11px;
 }
 
 .bubble .pointer.bottom {
+  bottom: -11px;
   transform: rotate(180deg);
-  bottom: -11px;
 }
 
 .bubble .close-x {
   background: -webkit-image-set(
     url(../../file_manager/foreground/images/common/close_x_gray.png) 1x,
     url(../../file_manager/foreground/images/common/2x/close_x_gray.png) 2x);
   height: 21px;
   opacity: 0.3;
   position: absolute;
   right: 3px;
@@ skipping 391 matching lines @@
   overflow: hidden;
   position: absolute;
   width: 100%;
 }
 
 .gallery .image-wrapper > img {
   position: absolute;
 }
 
 .gallery .image-wrapper > img:not(.cached) {
-  -webkit-animation: fadeIn 500ms ease-in;
+  animation: fadeIn 500ms ease-in;
 }
 
-@-webkit-keyframes fadeIn {
+@keyframes fadeIn {
   from {
     opacity: 0;
   }
   to {
     opacity: 1;
   }
 }
 
 .gallery .ribbon-image > .indicator {
   -webkit-transition: opacity 500ms ease-in;
@@ skipping 83 matching lines @@
   transition-property: opacity, transform;
   transition-timing-function: linear;
 }
 
 .gallery[editing] .edit-mode-toolbar .saved {
   color: white;
   opacity: 0.5;
 }
 
 .gallery .edit-mode-toolbar .saved[highlighted] {
+  opacity: 1;
   transform: scaleX(1.1) scaleY(1.1) rotate(0);
-  opacity: 1;
 }
 
 /* Editor buttons. */
 
 .gallery .toolbar .edit-main {
   align-items: center;
   color: white;
   display: flex;
   height: 48px;
   justify-content: center;
@@ skipping 838 matching lines @@
 .thumbnail-view .animation-thumbnail {
   background-repeat: no-repeat;
   background-size: cover;
   display: none;
   position: absolute;
 }
 
 .thumbnail-view .animation-thumbnail.animating {
   display: block;
 }