Tidy up payload attestation verification

consensus/types/src/attestation/indexed_payload_attestation.rs

@@ -2,7 +2,6 @@ use crate::test_utils::TestRandom;
 use crate::{EthSpec, ForkName, PayloadAttestationData};
 use bls::AggregateSignature;
 use context_deserialize::context_deserialize;
-use core::slice::Iter;
 use serde::{Deserialize, Serialize};
 use ssz_derive::{Decode, Encode};
 use ssz_types::VariableList;
@@ -21,12 +20,6 @@ pub struct IndexedPayloadAttestation<E: EthSpec> {
     pub signature: AggregateSignature,
 }
 
-impl<E: EthSpec> IndexedPayloadAttestation<E> {
-    pub fn attesting_indices_iter(&self) -> Iter<'_, u64> {
-        self.attesting_indices.iter()
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;