Reduce webkit CSS prefixes in ui/ styles

ui/file_manager/video_player/css/media_controls.css

Index: ui/file_manager/video_player/css/media_controls.css
diff --git a/ui/file_manager/video_player/css/media_controls.css b/ui/file_manager/video_player/css/media_controls.css
index 6c0ff616d022b822bc1e7f7ddbaf0a4234a2b794..79ce9d8cb8d69f5f396ee7e2b2925ed33ad403bc 100644
--- a/ui/file_manager/video_player/css/media_controls.css
+++ b/ui/file_manager/video_player/css/media_controls.css
@@ -194,7 +194,7 @@ paper-slider.volume {
 }
 
 .playback-state-icon {
-  -webkit-animation: none;
+  animation: none;
   background-position: center center;
   background-repeat: no-repeat;
   display: none;
@@ -230,7 +230,7 @@ paper-slider.volume {
 }
 
 .text-banner[visible] {
-  -webkit-animation: text-banner-blowup 3000ms;
+  animation: text-banner-blowup 3000ms;
   display: block;
 }
 
@@ -238,7 +238,7 @@ paper-slider.volume {
   display: block;
 }
 
-@-webkit-keyframes blowup {
+@keyframes blowup {
   from {
     opacity: 1;
   }
@@ -248,7 +248,7 @@ paper-slider.volume {
   }
 }
 
-@-webkit-keyframes text-banner-blowup {
+@keyframes text-banner-blowup {
   from {
     transform: scale(0.5);
     opacity: 0;
@@ -268,14 +268,14 @@ paper-slider.volume {
 }
 
 .playback-state-icon[state='play'] {
-  -webkit-animation: blowup 500ms;
+  animation: blowup 500ms;
   background-image: -webkit-image-set(
     url(../images/media/media_play_onscreen.png) 1x,
     url(../images/media/2x/media_play_onscreen.png) 2x);
 }
 
 .playback-state-icon[state='pause'] {
-  -webkit-animation: blowup 500ms;
+  animation: blowup 500ms;
   background-image: -webkit-image-set(
     url(../images/media/media_pause_onscreen.png) 1x,
     url(../images/media/2x/media_pause_onscreen.png) 2x);