Revert D28474878: Always use intrusive_ptr for Message (1 out of 2)
Test Plan: revert-hammer
Differential Revision:
D28474878 (https://github.com/pytorch/pytorch/commit/4d704e607d2a785a3b45d38baf9e56cff02444d9)
Original commit changeset: 5b76d45e05f6
fbshipit-source-id: 677c5bc7f02dca23213f778eb0e626a2f6600f3b
