Remove unecessary headers in HandshakeLayer.cpp (#56)
Remove unecessary headers in HandshakeLayer.cpp (#56)

Summary:
Trivial cleanup.
Pull Request resolved: https://github.com/facebookincubator/mvfst/pull/56

Reviewed By: mjoras

Differential Revision: D17898083

Pulled By: lnicco

fbshipit-source-id: 961bad1e9e38fbffed39b07e08a782d27f007175

facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst