Remove the fd overload of AsyncSocket::AsyncSocket
Remove the fd overload of AsyncSocket::AsyncSocket

Summary: It should be dead now.

Reviewed By: yfeldblum

Differential Revision: D14350795

fbshipit-source-id: 30a021c0180b73b9d76e34722353c4e65e1c98f8

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