Now that we have WeakListHashSet, we should use it for m_styleSheetCandidateNodes in StyleScope
Pull request: https://github.com/WebKit/WebKit/pull/9356
Committed 259698@main (7270cc8dcf9c): <https://commits.webkit.org/259698@main> Reviewed commits have been landed. Closing PR #9356 and removing active labels.
<rdar://problem/104922143>