Minor change to `PhutilInfrastructureTestCase`

Summary: Update `PhutilInfrastructureTestCase` after D9860 and D9861.

Test Plan: `arc unit` should do the trick.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9862