R1:3328e78a7b4c

Sort out EditController / ManageController / EditproController Diffusion hierarchy

Summary: Ref T10923. This cleans up the remaining "pro" mess left by the cutover.

Test Plan: Viewed, managed, edited a repository.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10923

Differential Revision: https://secure.phabricator.com/D15871