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This CL adds another test path for safety tip testing, this time with a
publicly-accessible URL.

Change-Id: I3aabd87401bd8bc602188293dfe9bdbc13a766a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769305
Auto-Submit: Joe DeBlasio <jdeblasio@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Commit-Queue: Joe DeBlasio <jdeblasio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690037}