Update isMasonryRows/Columns to areMasonryRows/Columns
Pull request: https://github.com/WebKit/WebKit/pull/7625
Committed 257888@main (b9b7b85430bc): <https://commits.webkit.org/257888@main> Reviewed commits have been landed. Closing PR #7625 and removing active labels.
<rdar://problem/103379428>