This class creates several observers, which need to be removed when appropriate. This bug is to do that.
rdar://109060751
Pull request: https://github.com/WebKit/WebKit/pull/14274
Committed 264485@main (52e6f05d3e91): <https://commits.webkit.org/264485@main> Reviewed commits have been landed. Closing PR #14274 and removing active labels.