Rename a setViewer call to setUser to fix a fatal.

Summary: Fixes T2303.

Test Plan: Rendered /uiexample/view/PhabricatorTimelineExample/ without a fatal

Reviewers: chad, epriestley, btrahan

Reviewed By: btrahan

CC: aran, Korvin

Maniphest Tasks: T2303

Differential Revision: https://secure.phabricator.com/D4387

src/applications/uiexample/examples/PhabricatorTimelineExample.php

@@ -111,7 +111,7 @@ final class PhabricatorTimelineExample extends PhabricatorUIExample {
 
     $anchor = 0;
     foreach ($events as $event) {
-      $event->setViewer($user);
+      $event->setUser($user);
       $event->setDateCreated(time() + ($anchor * 60 * 8));
       $event->setAnchor(++$anchor);
     }