R1:c2ac63e9ad1f

Increase visibility of `PhabricatorController::buildApplicationMenu` methods

Summary: Ref T6822. This method needs to be `public` because it is called from `PhabricatorApplicationSearchController::buildApplicationMenu()`.

Test Plan: I wouldn't expect //increasing// method visibility to break anything.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6822

Differential Revision: https://secure.phabricator.com/D11416