[wpt] upgrade IndexedDB tests to non-tentative (#47153)
These are supported cross vendor:
https://wpt.fyi/results/IndexedDB?label=experimental&label=master&aligned&q=tentative
Bug: 3534256
Change-Id: Ic7ec970fbd4d5710d45065bfba6a27f60a59990e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5713772
Auto-Submit: Ari Chivukula arichiv@chromium.org
Commit-Queue: Steven Bingler bingler@chromium.org
Commit-Queue: Ari Chivukula arichiv@chromium.org
Reviewed-by: Steven Bingler bingler@chromium.org
Cr-Commit-Position: refs/heads/main@{#1328291}
Co-authored-by: Ari Chivukula arichiv@chromium.org