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private.

This is part of a larger update to clean up the creation of
CanonicalCookie instances and make the default constructor private.

I verified the tests pass when the default constructor is private by
changing canonical_cookie.h when building/running net_unittests.

Bug: 1102874
Change-Id: I21e6a53d521025cd485d0abff482184143d1bf12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2564942Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Commit-Queue: Dylan Cutler <dylancutler@google.com>
Cr-Commit-Position: refs/heads/master@{#832373}