Centralize getComposedRanges tests under wpt/selection/shadow-dom/tentative/
Change-Id: Ibe2b32f701399669febb679329efb52531902586
Bug: 40286116
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5792119
Auto-Submit: Di Zhang dizhangg@chromium.org
Commit-Queue: Siye Liu siliu@microsoft.com
Reviewed-by: Siye Liu siliu@microsoft.com
Cr-Commit-Position: refs/heads/main@{#1342509}