Cookie Store: Move non-ASCII codepoint test cases to dedicated tests

Cookie handling of non-ASCII codepoints is not consistent across
browsers, so we definitely want tests that exercise these. To make
potential failures here more obvious, make sure that there are
dedicated test cases for non-ASCII interop with other ways of
getting/setting cookies (HTTP headers, document.cookie).

Also, make the document.cookie interop tests symmetric:
set/overwrite/delete by CookieStore observed by document.cookie and
vice versa.

Bug: 729800
Change-Id: I637401e5f8021a2915ba186fbb1cf7a50e940905
Reviewed-on: https://chromium-review.googlesource.com/1036306
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554936}
5 files changed