Revert "Flushing out requestAnimationFrame polyfill further."

lib/html/idl/dart/dart.idl

Index: lib/html/idl/dart/dart.idl
diff --git a/lib/html/idl/dart/dart.idl b/lib/html/idl/dart/dart.idl
index d9b739d84d473375f131c6ccaacf5a688b072a7f..e7ccb98b1418d0a58225c7b4ade64200c2f7a4dc 100644
--- a/lib/html/idl/dart/dart.idl
+++ b/lib/html/idl/dart/dart.idl
@@ -347,11 +347,3 @@ module websockets {
   };
 }
 
-module core {
-  [supplemental, Callback]
-  interface RequestAnimationFrameCallback {
-    // Webkit implements this as returning bool, but standard is void.
-    [Suppressed] boolean handleEvent(in DOMTimeStamp time);
-    void handleEvent(in DOMTimeStamp time);
-  };
-}