Implement ApplicationSearch in Files

Summary: Ref T2625. Ref T1163. A couple of small generalization nudges, but this is almost entirely straightforward.

Test Plan: Executed various File queries.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1163, T2625

Differential Revision: https://secure.phabricator.com/D6091

src/applications/files/controller/PhabricatorFileController.php

@@ -29,13 +29,9 @@ abstract class PhabricatorFileController extends PhabricatorController {
       $menu->newLink(pht('Upload File'), $this->getApplicationURI('/upload/'));
     }
 
-    $menu->newLabel(pht('Filters'));
-
-    $menu->newLink(pht('My Files'), $this->getApplicationURI('filter/my/'))
-      ->setKey('my');
-
-    $menu->newLink(pht('All Files'), $this->getApplicationURI('filter/all/'))
-      ->setKey('all');
+    id(new PhabricatorFileSearchEngine())
+      ->setViewer($this->getRequest()->getUser())
+      ->addNavigationItems($menu);
 
     return $menu;
   }