Refactor Masonry Tests
Pull request: https://github.com/WebKit/WebKit/pull/7093
Pull request: https://github.com/WebKit/WebKit/pull/7120
Committed 257339@main (35bac27bc4f5): <https://commits.webkit.org/257339@main> Reviewed commits have been landed. Closing PR #7120 and removing active labels.
<rdar://problem/102941541>