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After https://chromium-review.googlesource.com/c/chromium/src/+/1982549,
we treat cookies with neither names nor values as invalid. This patch
adjusts `ParsedCookie::SetName()` and `ParsedCookie::SetValue()` to
ensure that a `ParsedCookie` can't be modified into an invalid cookie.
It also applies the rule to `CanonicalCookie::CreateSanitizedCookie`
to ensure that code path has the same restrictions.

Bug: 1040296
Change-Id: I1e57c3ee8a4f6dc222c35d6e9844928c1ba7fb06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1993962
Commit-Queue: Mike West <mkwst@chromium.org>
Reviewed-by: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733943}