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AAGUID length received from AuthenticatorGetInfo response must be of
length 16[1]. Add this check when parsing response from device and if
AAGUID length is any number other than 16, return base::nullopt.

[1]: https://fidoalliance.org/specs/fido-v2.0-rd-20170927/fido-client-to-authenticator-protocol-v2.0-rd-20170927.html#authenticatorgetinfo-0x04

Bug: 872217
Change-Id: I58e86942ef7eedd3075dabcf49c25407ce3c3050
Reviewed-on: https://chromium-review.googlesource.com/1167798
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582069}