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This CL is part of plan that chromium talks to attestationd and bypass
cryptohomed for attestation-related APIs.

BUG=b:158955123

Change-Id: I7be67f3420fb114ab11203dd44e73bca4aa11574
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2249276
Commit-Queue: Leo Lai <cylai@google.com>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784399}