Kill most defaults in Declarations.cwrap. (#25610)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25610
They don't do anything anymore, since this isn't the end-user interface.
Test Plan: Imported from OSS
Differential Revision: D17172495
Pulled By: gchanan
fbshipit-source-id: a380d970f0836ed85eb9ac2aa42eb73655d775aa
