[wpt] upgrade content-security-policy tests to non-tentative
These are supported cross vendor:
https://wpt.fyi/results/content-security-policy?label=experimental&label=master&aligned&q=tentative
Bug: 3534256
Change-Id: I33ce29003a285ba46c1449674ca1a1e222d99c42
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5713949
Commit-Queue: Ari Chivukula arichiv@chromium.org
Auto-Submit: Ari Chivukula arichiv@chromium.org
Reviewed-by: Steven Bingler bingler@chromium.org
Commit-Queue: Steven Bingler bingler@chromium.org
Cr-Commit-Position: refs/heads/main@{#1328195}