Remove unused var from block_producer

It was made redundant when `proposer_slots` was removed.

eth2/block_producer/src/lib.rs

@@ -4,7 +4,7 @@ mod traits;
 use slot_clock::SlotClock;
 use ssz::ssz_encode;
 use std::sync::Arc;
-use types::{BeaconBlock, ChainSpec, PublicKey, Slot};
+use types::{BeaconBlock, ChainSpec, Slot};
 
 pub use self::traits::{
     BeaconNode, BeaconNodeError, DutiesReader, DutiesReaderError, PublishOutcome, Signer,
@@ -48,7 +48,6 @@ pub enum Error {
 /// Relies upon an external service to keep the `EpochDutiesMap` updated.
 pub struct BlockProducer<T: SlotClock, U: BeaconNode, V: DutiesReader, W: Signer> {
     pub last_processed_slot: Option<Slot>,
-    pubkey: PublicKey,
     spec: Arc<ChainSpec>,
     epoch_map: Arc<V>,
     slot_clock: Arc<T>,
@@ -60,7 +59,6 @@ impl<T: SlotClock, U: BeaconNode, V: DutiesReader, W: Signer> BlockProducer<T, U
     /// Returns a new instance where `last_processed_slot == 0`.
     pub fn new(
         spec: Arc<ChainSpec>,
-        pubkey: PublicKey,
         epoch_map: Arc<V>,
         slot_clock: Arc<T>,
         beacon_node: Arc<U>,
@@ -68,7 +66,6 @@ impl<T: SlotClock, U: BeaconNode, V: DutiesReader, W: Signer> BlockProducer<T, U
     ) -> Self {
         Self {
             last_processed_slot: None,
-            pubkey,
             spec,
             epoch_map,
             slot_clock,
@@ -238,11 +235,9 @@ mod tests {
         let produce_epoch = produce_slot.epoch(spec.epoch_length);
         epoch_map.map.insert(produce_epoch, produce_slot);
         let epoch_map = Arc::new(epoch_map);
-        let keypair = Keypair::random();
 
         let mut block_producer = BlockProducer::new(
             spec.clone(),
-            keypair.pk.clone(),
             epoch_map.clone(),
             slot_clock.clone(),
             beacon_node.clone(),