Remove =deleted deprecated Future APIs
Remove =deleted deprecated Future APIs

Summary: Functions were deprecated and =deleted to communicate their removal with a clear error rather than having the functions simply disappear. They have been in this state for long enough to cleanly remove them.

Reviewed By: yfeldblum

Differential Revision: D15057175

fbshipit-source-id: fc9bb193e3cc9157ef6b898f0e4b7717581c1cdd

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly