Small dependency cleanup
Small dependency cleanup

Summary: Cpp2ConnectionContext only needs TAsyncTransport, not TAsyncSocket or TAsyncSSLSocket.

Reviewed By: yfeldblum

Differential Revision: D6029635

fbshipit-source-id: c1cc9a20f1862ec62e98943abdba53a5c7c7ac64

kwlzn/watchman,nodakai/watchman,wez/watchman,facebook/watchman,facebook/watchman,facebook/watchman,wez/watchman,nodakai/watchman,kwlzn/watchman,wez/watchman,nodakai/watchman,nodakai/watchman,wez/watchman,facebook/watchman,facebook/watchman,facebook/watchman,wez/watchman,kwlzn/watchman,kwlzn/watchman,kwlzn/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,nodakai/watchman,wez/watchman,facebook/watchman,kwlzn/watchman,kwlzn/watchman,facebook/watchman,wez/watchman,nodakai/watchman,wez/watchman,wez/watchman