Use assert_instances_of() in Differential

Summary: NOTE: This is not produced by a script so there might be errors. Please review carefully.

Test Plan: Browse around Differential.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran

Differential Revision: https://secure.phabricator.com/D2103

src/applications/differential/view/inlinecomment/DifferentialInlineCommentView.php

@@ -42,6 +42,7 @@ final class DifferentialInlineCommentView extends AphrontView {
   }
 
   public function setHandles(array $handles) {
+    assert_instances_of($handles, 'PhabricatorObjectHandle');
     $this->handles = $handles;
     return $this;
   }