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

src/infrastructure/testing/__tests__/PhabricatorTrivialTestCase.php

@@ -9,7 +9,7 @@ final class PhabricatorTrivialTestCase extends PhabricatorTestCase {
 
   private $two;
 
-  public function willRunOneTest($test_name) {
+  protected function willRunOneTest($test_name) {
     // You can execute setup steps which will run before each test in this
     // method.
     $this->two = 2;