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It's setting a 3rd-party-accessible cookie, so it must be secure

Bug: 1006816
Change-Id: I1a2511f9f682ddf103beba987d76e013d0b2750a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860102Reviewed-by: Lily Chen <chlily@chromium.org>
Commit-Queue: Maksim Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705581}