Summary:
In order to make this more flow typed and modern we need to get it off of createReactClass. This change converts the class as is with no intended behavior changes to an ES6 class.
Changelog: [Internal]
Reviewed By: JoshuaGross
Differential Revision: D18443018
fbshipit-source-id: 831921976e9de8e965180cdefd1c4a154f04bfea