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The test is making a 3rd-party accessible cookie; we're going to require
those to be secure.

Also fix a bug in the test --- it was trying to append http:// twice.

Bug: 1006816
Change-Id: I0d2cda25892b6633b0bc9c362d735540cde456b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860099
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705583}