Remove unneeded code (#11117)

* Remove unneeded code

* Remove unused imports

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

substrate/frame/whitelist/src/lib.rs

@@ -39,7 +39,7 @@ mod mock;
 mod tests;
 pub mod weights;
 
-use codec::{Decode, DecodeLimit, Encode, FullCodec, MaxEncodedLen};
+use codec::{DecodeLimit, Encode, FullCodec};
 use frame_support::{
 	ensure,
 	traits::{PreimageProvider, PreimageRecipient},
@@ -51,12 +51,6 @@ use sp_std::prelude::*;
 
 pub use pallet::*;
 
-#[derive(Clone, Encode, Decode, TypeInfo, MaxEncodedLen)]
-pub struct Preimage<BoundedVec, Balance, AccountId> {
-	preimage: BoundedVec,
-	deposit: Option<(AccountId, Balance)>,
-}
-
 #[frame_support::pallet]
 pub mod pallet {
 	use super::*;