Fix method visibility for PhabricatorApplicationSearchEngine methods

Summary: Ref T6822.

Test Plan: Visual inspection. These methods are only called from within the `PhabricatorApplicationSearchEngine` class.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6822

Differential Revision: https://secure.phabricator.com/D11242

src/applications/repository/query/PhabricatorRepositoryPushLogSearchEngine.php

@@ -7,7 +7,7 @@ final class PhabricatorRepositoryPushLogSearchEngine
     return pht('Push Logs');
   }
 
-  public function getApplicationClassName() {
+  protected function getApplicationClassName() {
     return 'PhabricatorDiffusionApplication';
   }
 
@@ -90,7 +90,7 @@ final class PhabricatorRepositoryPushLogSearchEngine
     return '/diffusion/pushlog/'.$path;
   }
 
-  public function getBuiltinQueryNames() {
+  protected function getBuiltinQueryNames() {
     return array(
       'all' => pht('All Push Logs'),
     );