Summary:
After D4825, this information is often available to us in a safe way. Provide it explictly.
This removes or reduces functionality in some cases, but I think we can plug those holes with Conpherence addresses and/or explicit user acknowledgement/config.
Test Plan: Patched a commit with `arc patch` and got the original address out.
Reviewers: btrahan, edward, vrana
Reviewed By: btrahan
CC: aran
Differential Revision: https://secure.phabricator.com/D4828
Summary: Used only by Facebook.
Test Plan: Moved to Facebook repo and verified it still works.
Reviewers: nh, epriestley
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D4515