Summary: Also change the internal API so it no longer accepts the "heads" argument.
Reviewed By: ryanmce
Differential Revision: D6745865
fbshipit-source-id: 368742be49b192f7630421003552d0a10eb0b76d
Summary:
We moved the `fastannotate` itself, let's move the tests now.
Depends on D6683689
Test Plan: - run tests in the next commit in this stack
Reviewers: #sourcecontrol
Differential Revision: https://phabricator.intern.facebook.com/D6683764