Move LegalpadDocument to new phid stuff

Summary: ref T2715 - apologies btw as I didn't catch the "start from the bottom" ask until recently... :/

Test Plan: phid.query for some legalpad documents... booya. also loaded legalpad.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2715

Differential Revision: https://secure.phabricator.com/D6576

src/applications/phid/PhabricatorObjectHandle.php

@@ -111,7 +111,6 @@ final class PhabricatorObjectHandle
       PhabricatorPHIDConstants::PHID_TYPE_USER => 'User',
       PhabricatorPHIDConstants::PHID_TYPE_BLOG => 'Blog',
       PhabricatorPHIDConstants::PHID_TYPE_POST => 'Post',
-      PhabricatorPHIDConstants::PHID_TYPE_LEGD => 'Legalpad Document',
     );
 
     return idx($map, $this->getType(), $this->getType());