Revert "Changing return value of request animation frame."

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 2d89bf89ecc31e4aa9ecb5551c4ca8b298eb0220..98193a4bdce7e23c83265bc3df0484aec790f292 100644
--- a/lib/html/idl/dart/dart.idl
+++ b/lib/html/idl/dart/dart.idl
@@ -402,11 +402,3 @@ 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);
-  };
-}