Reduce webkit CSS prefixes in ui/ styles

ui/webui/resources/css/overlay.css

Index: ui/webui/resources/css/overlay.css
diff --git a/ui/webui/resources/css/overlay.css b/ui/webui/resources/css/overlay.css
index 3b3340d26de7cf333f8ee5d2abfc47b62ea5d8d6..8912bc8f285c3739ce988c8dd72950b2b3b90cc3 100644
--- a/ui/webui/resources/css/overlay.css
+++ b/ui/webui/resources/css/overlay.css
@@ -8,8 +8,8 @@
   -webkit-box-orient: vertical;
   -webkit-box-pack: center;
   /* TODO(dbeam): remove perspective when http://crbug.com/374970 is fixed. */
-  -webkit-perspective: 1px;
-  -webkit-transition: 200ms opacity;
+  perspective: 1px;
+  transition: 200ms opacity;
   background-color: rgba(255, 255, 255, 0.75);
   bottom: 0;
   display: -webkit-box;
@@ -32,7 +32,7 @@
 .overlay .page {
   -webkit-border-radius: 3px;
   -webkit-box-orient: vertical;
-  -webkit-transition: 200ms transform;
+  transition: 200ms transform;
   background: white;
   box-shadow: 0 4px 23px 5px rgba(0, 0, 0, 0.2), 0 2px 6px rgba(0,0,0,0.15);
   color: #333;
@@ -46,11 +46,11 @@
 /* If the options page is loading don't do the transition. */
 .loading .overlay,
 .loading .overlay .page {
-  -webkit-transition-duration: 0ms !important;
+  transition-duration: 0ms !important;
 }
 
 /* keyframes used to pulse the overlay */
-@-webkit-keyframes pulse {
+@keyframes pulse {
  0% {
    transform: scale(1);
  }
@@ -66,10 +66,10 @@
 }
 
 .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 {