Remove getPagingColumn() / getReversePaging()

Summary: Ref T7803. Remove these in favor of more generalized paging and ordering.

Test Plan: Sorted and paged results in various applications.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7803

Differential Revision: https://secure.phabricator.com/D12378

src/applications/differential/query/DifferentialHunkQuery.php

@@ -112,8 +112,9 @@ final class DifferentialHunkQuery
     return 'PhabricatorDifferentialApplication';
   }
 
-  protected function getReversePaging() {
-    return true;
+  protected function getDefaultOrderVector() {
+    // TODO: Do we need this?
+    return array('-id');
   }
 
 }