Cover redirects to files in more cases

Summary: Ref T5894. We have a couple more similar cases. Make them all do a decision-based redirect for now.

Test Plan: Did "View Raw File" and such, and also made sure thumbnails still work.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T5894

Differential Revision: https://secure.phabricator.com/D10301

src/applications/diffusion/controller/DiffusionCommitController.php

@@ -1042,7 +1042,7 @@ final class DiffusionCommitController extends DiffusionController {
         $drequest->getRepository()->getPHID());
     unset($unguarded);
 
-    return id(new AphrontRedirectResponse())->setURI($file->getBestURI());
+    return $file->getRedirectResponse();
   }
 
   private function renderAuditStatusView(array $audit_requests) {