pytorch

c53b3ed2 - Revert D34805092: Extend _save_for_mobile and _load_for_mobile to support flatbuffer format; Default format is pickle + Change buck targets to support `only pickle` and `pickle + flatbuffer` for migration

Revert D34805092: Extend _save_for_mobile and _load_for_mobile to support flatbuffer format; Default format is pickle + Change buck targets to support `only pickle` and `pickle + flatbuffer` for migration Test Plan: revert-hammer Differential Revision: D34805092 (https://github.com/pytorch/pytorch/commit/284b2b713592728c362d2d9a2813e021895e89eb) Original commit changeset: 57f3fc81d68f Original Phabricator Diff: D34805092 (https://github.com/pytorch/pytorch/commit/284b2b713592728c362d2d9a2813e021895e89eb) fbshipit-source-id: 780dfb6fd6ba5f9348f24a2fb3c57971b7155541 (cherry picked from commit bebeb8b84e11c34cbde4857d0e1c291731a7c781)