Remove webkit prefixes for CSS Animation in ui/ styles

ui/file_manager/file_manager/foreground/css/common.css

Index: ui/file_manager/file_manager/foreground/css/common.css
diff --git a/ui/file_manager/file_manager/foreground/css/common.css b/ui/file_manager/file_manager/foreground/css/common.css
index d212ea9bad08e44409d5ff341ed1c386b1650a1a..66ea9ad7f72ec770c5f0ae2bf0539b7ee327e655 100644
--- a/ui/file_manager/file_manager/foreground/css/common.css
+++ b/ui/file_manager/file_manager/foreground/css/common.css
@@ -227,7 +227,7 @@ html[dir='rtl'] .entry-name {
   outline: none;
 }
 
-@-webkit-keyframes pulse {
+@keyframes pulse {
  0% {
    transform: scale(1);
  }
@@ -243,10 +243,10 @@ html[dir='rtl'] .entry-name {
 }
 
 .cr-dialog-frame.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;
 }
 
 .shown > .cr-dialog-frame {