Allow filtering by lint code in Diffusion

Test Plan:
/diffusion/ARC/lint/master/src/, clicked on count link.
/diffusion/ARC/browse/master/src/difference/?lint=XHP9, clicked on file name.
/diffusion/ARC/browse/master/src/difference/ArcanistDiffUtils.php?lint=, verified that all messages are displayed.
/diffusion/ARC/browse/master/src/difference/ArcanistDiffUtils.php?lint=XHP9.
/diffusion/ARC/browse/master/src/difference/ArcanistDiffUtils.php?lint=TXT3, verified that 0 messages are displayed.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3929

src/applications/diffusion/controller/DiffusionDiffController.php

@@ -6,7 +6,9 @@ final class DiffusionDiffController extends DiffusionController {
     $data = $data + array(
       'dblob' => $this->getRequest()->getStr('ref'),
     );
-    $drequest = DiffusionRequest::newFromAphrontRequestDictionary($data);
+    $drequest = DiffusionRequest::newFromAphrontRequestDictionary(
+      $data,
+      $this->getRequest());
 
     $this->diffusionRequest = $drequest;
   }