Clean up wpt tests for attr() security
Clean up wpt tests for attr() security violations, add tests for url()
function and tests reflecting the following spec changes [0].
Bug: 40320391
Change-Id: I05d73f4ee78aff1ccd0ae7f90584f5f5a9353b09
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6020647
Reviewed-by: Anders Hartvoll Ruud andruud@chromium.org
Commit-Queue: Munira Tursunova moonira@google.com
Cr-Commit-Position: refs/heads/main@{#1386745}