Remove webkit prefixes for transform and perspective in ui/ styles

ui/login/screen_container.css

Index: ui/login/screen_container.css
diff --git a/ui/login/screen_container.css b/ui/login/screen_container.css
index 848d04c228480ef3f5da84c9f04bcac4719ed2c0..446669f73114e64f18f950d37cf2bf6b63e50ce6 100644
--- a/ui/login/screen_container.css
+++ b/ui/login/screen_container.css
@@ -6,11 +6,11 @@
 #outer-container {
   -webkit-box-align: center;
   -webkit-box-pack: center;
-  -webkit-perspective: 1px; /* Workaround, see http://crbug.com/360567 */
   bottom: 57px;  /* Leave space for the header bar */
   display: -webkit-box;
   left: 0;
   min-height: 717px; /* This enables scrolling. Min resolution: 1024x768 */
+  perspective: 1px; /* Workaround, see http://crbug.com/360567 */
   position: absolute;
   right: 0;
   top: 0;
@@ -18,8 +18,8 @@
 }
 
 .oobe-display #outer-container {
-  -webkit-perspective: 600px;
   bottom: 47px; /* header-bar is 47 pixels high during OOBE */
+  perspective: 600px;
 }
 
 .pin-container.pin-enabled {