Revert D25304229: [pytorch][PR] Add type annotations to torch.onnx.* modules
Test Plan: revert-hammer
Differential Revision:
D25304229 (https://github.com/pytorch/pytorch/commit/8bc6023d7a822ea6936b7460027f29558149008d)
Original commit changeset: b01b21ddbf86
fbshipit-source-id: bc3308176e2c70423f29f694e9db94828213e7d6
