VideoFullscreenManager.h should use WeakHasMap instead of HashMap of raw pointers.
Pull request: https://github.com/WebKit/WebKit/pull/16078
Committed 266304@main (bb1cedbd9872): <https://commits.webkit.org/266304@main> Reviewed commits have been landed. Closing PR #16078 and removing active labels.
<rdar://problem/112866488>