R1:b9646f31e988

Fix method visibility for `PhabricatorTrivialTestCase::willRunOneTest`

Summary: Ref T6822.

Test Plan: `grep` for `->willRunOneTest(`.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T6822

Differential Revision: https://secure.phabricator.com/D11365