removed redundant FixedHash trait, fixes #4029 (#4866)

util/src/bloom.rs

@@ -18,7 +18,7 @@
 
 use std::mem;
 use std::ops::DerefMut;
-use {H64, H160, H256, H512, H520, H2048, FixedHash};
+use {H64, H160, H256, H512, H520, H2048};
 
 /// Returns log2.
 pub fn log2(x: usize) -> u32 {

util/src/sha3.rs

@@ -19,7 +19,7 @@ extern crate sha3 as sha3_ext;
 
 use std::io;
 use tiny_keccak::Keccak;
-use hash::{H256, FixedHash};
+use hash::H256;
 use self::sha3_ext::*;
 
 /// Get the SHA3 (i.e. Keccak) hash of the empty bytes string.