Match server version of DM API proto.

Some fields are renamed:
* new_public_key_verification_signature
  --> new_public_key_verification_signature_deprecated
* PolicyPublicKeyAndDomain
  --> DEPRECATEDPolicyPublicKeyAndDomain
* RemoteCommand.unique_id
  --> RemoteCommand.command_id

BUG=645078

Review-Url: https://codereview.chromium.org/2453993004
Cr-Original-Commit-Position: refs/heads/master@{#429257}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 78ff9da2c0349d700b15428c6da567c61b894f1a
1 file changed