R1:0275feb53741

Remove unused DAO class

Summary: This class seems to be unused (or maybe I am missing something).

Test Plan: Unit tests still pass.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12565