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For "FIDO-U2F" attestation statement format, attestation credential data
within authenticator data is always present. However, for attestation
data received from CTAP authenticators, this may not be the case as the
WebAuthN spec defines attested credential data as optional. Change the
DCHECK conditions for none attestation statement format to execute only
when attested credential data is present.

Bug: 825455
Change-Id: Ie63f051846b67c9deaa1b6bb64de76efa49a7aa1
Reviewed-on: https://chromium-review.googlesource.com/979217Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545785}