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The new attestation flow doesn't rely on cryptohome client anymore.

as for testing, EnrollmentCertificateUploaderTest.* are passed.

Change-Id: Id289cdc1b2e2d4a27179f048c0d6e3d4d968cd88
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303743
Commit-Queue: Leo Lai <cylai@google.com>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789865}