R1:9ddc768bb648

Remove unused class

Summary: This class is unused after D4058. maybe let's remove it?

Test Plan: `grep`

Reviewers: chad, epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11125