GridMasonryLayout::addItemsToFirstTrack iterators over a HashMap that uses raw pointers as keys. The HashMap implementation would not allow this to happen so we can probably remove the check
<rdar://problem/103230303>
Pull request: https://github.com/WebKit/WebKit/pull/7455
Committed 257714@main (3f50a04024eb): <https://commits.webkit.org/257714@main> Reviewed commits have been landed. Closing PR #7455 and removing active labels.