Extend from Phobject
Summary: All base classes should extend from Phobject or some other classes. See D13275 for some explanation.
Test Plan: arc unit
Reviewers: Blessed Reviewers, epriestley
Reviewed By: Blessed Reviewers, epriestley
Subscribers: epriestley, Korvin
Differential Revision: https://secure.phabricator.com/D13281