Replace RemoveUnreferencedInterface with UnreferencedInterfacesPass
Replace RemoveUnreferencedInterface with UnreferencedInterfacesPass

Summary: We don't use "RemoveUnreferencedInterface" in our optimization passes. Replace it with UnreferencedInterfacesPass to keep the consistency.

Reviewed By: thezhangwei

Differential Revision: D28419611

fbshipit-source-id: 624358cdc95e1a521b32dad8dcc15e4e293dd2bb

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