R1:c26ea062d1fb

Remove unused PhrictionActionConstants class

Summary: This class is no longer used since D10792.

Test Plan: `grep`

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D13116