Replace it with NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION, because it
has been the same for a while.
MozReview-Commit-ID: 5agRGFyUry1
--HG--
extra : rebase_source : 5388c56b2f6905c6ef969150f0c5b77bf247624d
- A non-null value is now always returned, as VRDisplayEvent.display
is required.
MozReview-Commit-ID: IrE2a7rw3Co
--HG--
extra : rebase_source : ca27aa588e49a8e19cc29114dd477e84e39bacef