Cookie Store API: Remove `httpOnly` option

The option would seemingly allow the creation of HttpOnly cookies,
which is not permitted with the document.cookie API and we don't want
to introduce that capability here. This didn't work anyway as the API
would fail the cookie creation as coming from a non-HTTP source and
reject the script call, so just remove the option.

Spec issue: https://github.com/WICG/cookie-store/issues/41
Spec PR: https://github.com/WICG/cookie-store/pull/87

Bug: 729800
Change-Id: Id1115db5fbb432a3dd7647b565c5e7e8f45d4e14
Reviewed-on: https://chromium-review.googlesource.com/1160927
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580271}
4 files changed