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This change swaps a default net::CookieOptions to an all-inclusive
CookieOptions, which allows the test to set and get all cookies.

Previously, using the default CookieOptions, SameSite cookies could not
be set. This would be a problem when cookies become SameSite-by-default
(see https://www.chromestatus.com/feature/5088147346030592), because
the test would no longer be able to set and get the cookies it expects.

This change will allow the test to keep working when cookies are
SameSite-by-default.

Bug: 1016512
Change-Id: I8915aea124b3f3debb2f84bc58f950175875ee52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1875521Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709168}