Remove duplicate checkLayout util in WPT
In http://crrev.com/951195 I accidentally upstreamed a duplicate
checkLayout test function. This patch removes the duplicate and migrates
the one test which uses it to the other copy.
Context: #48705
Change-Id: Ic617e7aa7278cf365e42f40f4ed7c8ac80baccbb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5947328
Reviewed-by: Christian Biesinger cbiesinger@chromium.org
Reviewed-by: Di Zhang dizhangg@chromium.org
Commit-Queue: Joey Arhar jarhar@chromium.org
Cr-Commit-Position: refs/heads/main@{#1376406}