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"Clear & reset" used GURL::DomainIs() to check if a cookie belongs
to a specific domain. This doesn't handle cookies that are scoped
to a domain and all subdomains correctly.
E.g. a cookie for ".example.com" would not be removed if "example.com"
is cleared.
This is fixed by using CanonicalCookie::IsDomainMatch() instead,
which correctly determines if a cookie is visible to a domain.

Bug: 908364
Change-Id: If01fde74845c6c8a547ec86b0a3be8b9076b2d61
Reviewed-on: https://chromium-review.googlesource.com/c/1350634Reviewed-by: Peter Conn <peconn@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611278}