These classes have been moved to the public API too soon, and they need some
more time to mature before they can be declared stable.
Change-Id: I9c52a8e6cc103922abde7a6b911fe0c3e6bf5700
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3665
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
