R1:6e6e159dd79d

Remove unused Phame edge constants

Summary: This is dead code.

Test Plan: These edge types don't actually seem to be used?

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11076