crypto: Remove dead code

crypto/randentropy/rand_entropy.go

@@ -19,8 +19,6 @@ package randentropy
 import (
 	crand "crypto/rand"
 	"io"
-
-	"github.com/ethereum/go-ethereum/crypto/sha3"
 )
 
 var Reader io.Reader = &randEntropy{}
@@ -34,14 +32,6 @@ func (*randEntropy) Read(bytes []byte) (n int, err error) {
 	return len(bytes), nil
 }
 
-// TODO: copied from crypto.go , move to sha3 package?
-func Sha3(data []byte) []byte {
-	d := sha3.NewKeccak256()
-	d.Write(data)
-
-	return d.Sum(nil)
-}
-
 func GetEntropyCSPRNG(n int) []byte {
 	mainBuff := make([]byte, n)
 	_, err := io.ReadFull(crand.Reader, mainBuff)