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Because the value of a certificate profile is sent straight to
cryptohomed, it needs to match what is in CertificateProfile
in the cryptohomed source code.

See CryptohomeClient::AsyncTpmAttestationCreateCertRequest.

BUG=624187
TEST=none

Review-Url: https://codereview.chromium.org/2256643003
Cr-Commit-Position: refs/heads/master@{#412741}