Delete dead code (#37254)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/37254
This code is leftover from the KernelFactory deletion.
ghstack-source-id: 102866045
Test Plan: waitforsandcastle
Differential Revision: D21235480
fbshipit-source-id: 739ba677d2139ba9934d103f75a609638f1a3856
