Remove some unused properties

Summary: These class properties don't seem to be used.

Test Plan: Eyeball it.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D13295

src/applications/phid/storage/PhabricatorPHID.php

@@ -2,11 +2,6 @@
 
 final class PhabricatorPHID extends Phobject {
 
-  protected $phid;
-  protected $phidType;
-  protected $ownerPHID;
-  protected $parentPHID;
-
   public static function generateNewPHID($type, $subtype = null) {
     if (!$type) {
       throw new Exception(pht('Can not generate PHID with no type.'));