clean up ThriftType
clean up ThriftType

Reviewed By: Mizuchi

Differential Revision: D35802648

fbshipit-source-id: 95a5a37d3164005ee6da2eae1f81c2e25d514a49

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