Summary:
Ref T1191.
- This drops two tables.
- Both tables were migrated to transactions a very long time ago and no longer have readers or writers.
Test Plan: Saw ~150 fewer warnings.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T1191
Differential Revision: https://secure.phabricator.com/D10576
