Re-land [redex][redex-staging][remove-interface] Only remove interfaces with a limited number of implementers
Re-land [redex][redex-staging][remove-interface] Only remove interfaces with a limited number of implementers

Summary: Re-enable the change.

Reviewed By: ssj933

Differential Revision: D30846304

fbshipit-source-id: f95d53be92e5df5f4d670e59bf28d74109c2ab53

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex