Remove Channel ID methods and member from net::CookieStore

Bug: 875053
Change-Id: I1a0efc926bd73875a9f6612ca318648c217a17b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1580261
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Nick Harper <nharper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653699}
12 files changed