Remove deprecated API (#4993)

* Remove deprecated API

* Remove (some) allow(dead_code)

* Bump spec_version

* Fix import, remove allow dead code.

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

substrate/primitives/blockchain/src/error.rs

@@ -19,8 +19,6 @@
 use std::{self, error, result};
 use sp_state_machine;
 use sp_runtime::transaction_validity::TransactionValidityError;
-#[allow(deprecated)]
-use sp_block_builder::compatibility_v3;
 use sp_consensus;
 use derive_more::{Display, From};
 use codec::Error as CodecError;
@@ -150,17 +148,6 @@ impl<'a> From<&'a str> for Error {
 	}
 }
 
-#[allow(deprecated)]
-impl From<compatibility_v3::ApplyError> for ApplyExtrinsicFailed {
-	fn from(e: compatibility_v3::ApplyError) -> Self {
-		use self::compatibility_v3::ApplyError::*;
-		match e {
-			Validity(tx_validity) => Self::Validity(tx_validity),
-			e => Self::Msg(format!("Apply extrinsic failed: {:?}", e)),
-		}
-	}
-}
-
 impl Error {
 	/// Chain a blockchain error.
 	pub fn from_blockchain(e: Box<Error>) -> Self {