Summary: Ref T3655. Depends on D6633. This removes the writes and the column.
Test Plan: Created a project, edited a project. Verified the table doesn't have any keys including this column.
Reviewers: btrahan
Reviewed By: btrahan
CC: LegNeato, aran
Maniphest Tasks: T3655
Differential Revision: https://secure.phabricator.com/D6634
