Summary: Ref T4222. This was used by Facebook while developing Releeph, but should no longer be necessary since Releeph is in the upstream. I can't get an answer out of Facebook about whether they still use it or not (see T4227), so nuke it. We're going to replace it with a more general mechanism (see T4222). Test Plan: Regenerated celerity map. Browsed some pages, still got resources. Reviewers: btrahan, hach-que Reviewed By: hach-que CC: aran Maniphest Tasks: T4222 Differential Revision: https://secure.phabricator.com/D7863