It's just wrapping a RefPtr<Nicosia::Scene>>, so we can use the scene directly everywhere instead.
Pull request: https://github.com/WebKit/WebKit/pull/5904
Committed 256219@main (1c14974c54ee): <https://commits.webkit.org/256219@main> Reviewed commits have been landed. Closing PR #5904 and removing active labels.
<rdar://problem/101850026>