[SR] Remove unused operator() overload (#67001)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/67001
The overload of `operator()` taking `std::vector<at::Tensor>` was only used for testing. In a diff following this one, I will add a new overload that takes `std::vector<c10::IValue> args` and no `kwargs` so we can avoid default-constructing `kwargs` everywhere.
This new overload will probably take a forwarding reference, so to avoid problems with overloading on forwarding reference and simplify the interface, it's best to remove this unused one.
Test Plan:
`buck test caffe2/benchmarks/static_runtime/...`
`buck test caffe2/test:static_runtime`
Reviewed By: hlu1
Differential Revision: D31821990
fbshipit-source-id: 6d2e4a75ca4abe6e262651532eb96c3b274c6f4a
