Remove ChainWorkerState import

The `ChainWorkerActor` is used instead.

linera-core/src/worker.rs

@@ -51,7 +51,7 @@ use {
 };
 
 use crate::{
-    chain_worker::{ChainWorkerActor, ChainWorkerConfig, ChainWorkerRequest, ChainWorkerState},
+    chain_worker::{ChainWorkerActor, ChainWorkerConfig, ChainWorkerRequest},
     data_types::{ChainInfoQuery, ChainInfoResponse, CrossChainRequest},
     value_cache::ValueCache,
 };
@@ -710,21 +710,6 @@ where
         .await
     }
 
-    /// Creates a [`ChainWorkerState`] instance for a specific chain.
-    async fn create_chain_worker(
-        &self,
-        chain_id: ChainId,
-    ) -> Result<ChainWorkerState<StorageClient>, WorkerError> {
-        ChainWorkerState::load(
-            self.chain_worker_config.clone(),
-            self.storage.clone(),
-            self.recent_hashed_certificate_values.clone(),
-            self.recent_hashed_blobs.clone(),
-            chain_id,
-        )
-        .await
-    }
-
     /// Sends a request to the [`ChainWorker`] for a [`ChainId`] and waits for the `Response`.
     async fn query_chain_worker<Response>(
         &self,