Remove differential.anonymous-access

Summary:
Fixes T3034. This is obsoleted by modern policies.

This was written by a Facebook intern and is rarely used -- the Hive install might be the only use in the wild. It has never really worked correctly.

Test Plan: `grep`; browsed Differential.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3034

Differential Revision: https://secure.phabricator.com/D7568

src/applications/differential/controller/DifferentialChangesetViewController.php

@@ -2,14 +2,6 @@
 
 final class DifferentialChangesetViewController extends DifferentialController {
 
-  public function shouldRequireLogin() {
-    if ($this->allowsAnonymousAccess()) {
-      return false;
-    }
-
-    return parent::shouldRequireLogin();
-  }
-
   public function shouldAllowPublic() {
     return true;
   }