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DeviceOperation is an interface for Ctap{Register, Sign}Operation
and U2f{Register, Sign}Operation, and will be a branching point for
separation of logic between CTAP and U2F requests. CtapRegisterOperation
is an implementation of DeviceOperation and is owned by
MakeCredentialTask to handle dispatching CTAP MakeCredential request to
an authenticator.

Bug: 798573
Change-Id: I290ab7b3f686d4418d783723a0ab510f27362462
Reviewed-on: https://chromium-review.googlesource.com/1028792
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554565}