Revert "Use Subscription Manager from jsonrpc-pubsub (#6208)" (#6252)

This reverts commit ea1eb4e57f.

substrate/client/rpc/src/author/mod.rs

@@ -32,8 +32,8 @@ use rpc::futures::{
 };
 use futures::{StreamExt as _, compat::Compat};
 use futures::future::{ready, FutureExt, TryFutureExt};
-use sc_rpc_api::DenyUnsafe;
-use jsonrpc_pubsub::{typed::Subscriber, SubscriptionId, manager::SubscriptionManager};
+use sc_rpc_api::{DenyUnsafe, Subscriptions};
+use jsonrpc_pubsub::{typed::Subscriber, SubscriptionId};
 use codec::{Encode, Decode};
 use sp_core::{Bytes, traits::BareCryptoStorePtr};
 use sp_api::ProvideRuntimeApi;
@@ -55,7 +55,7 @@ pub struct Author<P, Client> {
 	/// Transactions pool
 	pool: Arc<P>,
 	/// Subscriptions manager
-	subscriptions: SubscriptionManager,
+	subscriptions: Subscriptions,
 	/// The key store.
 	keystore: BareCryptoStorePtr,
 	/// Whether to deny unsafe calls
@@ -67,7 +67,7 @@ impl<P, Client> Author<P, Client> {
 	pub fn new(
 		client: Arc<Client>,
 		pool: Arc<P>,
-		subscriptions: SubscriptionManager,
+		subscriptions: Subscriptions,
 		keystore: BareCryptoStorePtr,
 		deny_unsafe: DenyUnsafe,
 	) -> Self {
@@ -81,6 +81,7 @@ impl<P, Client> Author<P, Client> {
 	}
 }
 
+
 /// Currently we treat all RPC transactions as externals.
 ///
 /// Possibly in the future we could allow opt-in for special treatment