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AuthenticatorGetInfo, AuthenticatorGetNextAssertion, AuthenticatorReset,
and AuthenticatorCancel commands in CTAP protocol are requests with empty
parameter and are serialized to a single byte that represents command
type. Add object construct to encapsulate/serialize requests with empty
parameter.

Bug: 799355
Change-Id: I05a876a17bfb3dc1c1ef21d830f330db503856f6
Reviewed-on: https://chromium-review.googlesource.com/851673
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531937}