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- Added warn as one of the restriction levels,
and add the required unittests.
- Renamed the urls and patterns in the unittests
to reduce confusion.

Bug: 1169080
Change-Id: I806d1fb7aa8a4c94cd47b02e5be3a8636b2e26ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2642776
Commit-Queue: Aya Elsayed <ayaelattar@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846038}