Convert missing commit page to newPage

Summary: Minor conversion.

Test Plan: Fake a missing commit. View same layout.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D15608

src/applications/diffusion/controller/DiffusionCommitController.php

@@ -57,14 +57,13 @@ final class DiffusionCommitController extends DiffusionController {
             'Failed to load the commit because the commit has not been '.
             'parsed yet.'));
 
-      return $this->buildApplicationPage(
+      $title = pht('Commit Still Parsing');
-        array(
+
-          $crumbs,
+      return $this->newPage()
-          $error,
+        ->setTitle($title)
-        ),
+        ->setCrumbs($crumbs)
-        array(
+        ->appendChild($error);
-          'title' => pht('Commit Still Parsing'),
+
-        ));
     }
 
     $audit_requests = $commit->getAudits();