webkitRequestAimationFrame->requestAnimationFrame with hand edit to

lib/html/templates/html/dartium/impl_Window.darttemplate

Index: lib/html/templates/html/dartium/impl_Window.darttemplate
===================================================================
--- lib/html/templates/html/dartium/impl_Window.darttemplate	(revision 12920)
+++ lib/html/templates/html/dartium/impl_Window.darttemplate	(working copy)
@@ -8,11 +8,6 @@
     _addMeasurementFrameCallback(callback);
   }
 
-  int requestAnimationFrame(RequestAnimationFrameCallback callback) =>
-      webkitRequestAnimationFrame(callback);
-
-  void cancelAnimationFrame(int id) => webkitCancelAnimationFrame(id);
-
   // TODO(kasperl): Document these.
   lookupPort(String name) {
     var port = JSON.parse(localStorage['dart-port:$name']);