Revert D28474879: Always use intrusive_ptr for Message (2 out of 2)
Test Plan: revert-hammer
Differential Revision:
D28474879 (https://github.com/pytorch/pytorch/commit/ebf55a7d130c2082b3602535badfa0b065776112)
Original commit changeset: 498652a8b80a
fbshipit-source-id: 4d81e9769699356bf2a2ffc14b26f480bfeef9a1
