Remove deprecated caffe2::Tensor APIs (#15814)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15814
Plan is to remove the APIs we want to deprecate one by one and make sure it still builds in sandcastle and ossci
Reviewed By: ezyang
Differential Revision: D12812029
fbshipit-source-id: ea0c3dd882bec95fcd4507160ebc61f598b6d040
