message: remove unused impl for Blake2bHash.
diff: /// The number of bytes in a Blake2b hash
  -use std::{array::TryFromSliceError, borrow::Cow, convert::TryFrom};
  +use std::{array::TryFromSliceError, convert::TryFrom};
  use blake2::{
  digest::{Update, VariableOutput},
  @@ -10,7 +10,6 @@ use serde::{Deserialize, Serialize};
  use casper_types::{
  bytesrepr::{self, FromBytes, ToBytes},
  check_summed_hex,
  - check_summed_hex::CheckSummedHex,
  };
  /// Represents a 32-byte BLAKE2b hash digest
  @@ -97,17 +96,3 @@ impl FromBytes for Blake2bHash {
  FromBytes::from_bytes(bytes).map(|(arr, rem)| (Blake2bHash(arr), rem))
  }
  }
  -
  -impl CheckSummedHex<Blake2bHash> for Blake2bHash {
  - type Error = &'static str; // TODO: replace with proper error type.
  -
  - fn create_bytes(value: &Blake2bHash) -> Cow<[u8]> {
  - Cow::from(value.to_bytes().unwrap())
  - }
  -
  - fn from_bytes(bytes: &[u8]) -> Result<Blake2bHash, Self::Error> {
  - FromBytes::from_bytes(bytes)
  - .map(|(b, _rem)| b)
  - .map_err(|_error| "replace me with real error.")
  - }
  -}
  