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