Delete Message with claim id means that when a user deletes a message, the
message must be claimed. If you want to delete a message, you will have to use
both message id and claim id. This can improve the security of the message.
Change-Id: I81f505e6ac3ee8f8ab42ce0c1b80ecc878f67b78
blueprint: delete-message-with-claim-id
c180ddf93e