Remove dependency on parity-crypto (#2655)

substrate/core/keystore/Cargo.toml

@@ -6,7 +6,6 @@ edition = "2018"
 
 [dependencies]
 substrate-primitives = { path = "../primitives" }
-crypto = { package = "parity-crypto", version = "0.3", default-features = false }
 error-chain = "0.12"
 hex = "0.3"
 rand = "0.6"

substrate/core/keystore/src/lib.rs

@@ -30,8 +30,6 @@ use error_chain::{bail, error_chain, error_chain_processing, impl_error_chain_pr
 
 use substrate_primitives::{ed25519::{Pair, Public}, Pair as PairT};
 
-pub use crypto::KEY_ITERATIONS;
-
 error_chain! {
 	foreign_links {
 		Io(io::Error);