Use std::move() for shared_ptr<THeader> in RequestChannel clientSendT.
Use std::move() for shared_ptr<THeader> in RequestChannel clientSendT.

Summary: Move the shared_ptr<> in these cases to avoid a gratuitous reference inc/dec.

Reviewed By: yfeldblum

Differential Revision: D14599836

fbshipit-source-id: a293f0daf1dd1ef7b9638725116824266597e00c

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