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We will be requiring cookies marked to permit access in 3rd-party contexts
to be secure; and this test was creating an insecure one, so change it.

Bug: 1016512
Change-Id: I4205508d7ff145f7d81fe36fcfa5854963462de7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879192
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709308}