Set viewer for all handles loaded in controllers

Summary:
I've replaced all `id(new PhabricatorObjectHandleData(...))->loadHandles()` by `$this->loadViewerHandles(...)`.
Lint caught one usage in a static method.

Test Plan: Displayed revision with sporadic author.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3432

src/applications/differential/controller/DifferentialRevisionStatsController.php

@@ -125,8 +125,7 @@ final class DifferentialRevisionStatsController extends DifferentialController {
                               DifferentialAction::ACTION_CLOSE);
 
     $panels = array();
-    $handles = id(new PhabricatorObjectHandleData(array($params['phid'])))
-                  ->loadHandles();
+    $handles = $this->loadViewerHandles(array($params['phid']));
 
     $filter_form = id(new AphrontFormView())
       ->setAction('/differential/stats/'.$this->filter.'/')