It is not needed anymore with a separate field in ElementRareData for display:contents style.
<rdar://problem/107417124>
Pull request: https://github.com/WebKit/WebKit/pull/12174
Committed 263359@main (f6cad2b8abe3): <https://commits.webkit.org/263359@main> Reviewed commits have been landed. Closing PR #12174 and removing active labels.