Remove "commit hook mode" check from Javelin linter

Summary: Ref T7674. Commit hook mode is going away.

Test Plan: Eyeball it.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7674

Differential Revision: https://secure.phabricator.com/D12712

src/infrastructure/lint/linter/PhabricatorJavelinLinter.php

@@ -138,12 +138,6 @@ final class PhabricatorJavelinLinter extends ArcanistLinter {
       }
     }
 
-    if ($this->getEngine()->getCommitHookMode()) {
-      // Don't do the dependency checks in commit-hook mode because we won't
-      // have an available working copy.
-      return;
-    }
-
     $external_classes = array();
     foreach ($uses as $symbol => $line) {
       $parts = explode('.', $symbol);