Simplify Clear impl
Simplify Clear impl

Reviewed By: thedavekwon

Differential Revision: D38968891

fbshipit-source-id: 3929e64f4ec51f276d4d7bede7e8a6fe9de34c04

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift