Remove migration code. (#5291)

* Remove migration code.

* Fix cargo

* Bump spec version

substrate/frame/collective/src/lib.rs

@@ -168,17 +168,6 @@ decl_error! {
 	}
 }
 
-mod migration {
-	use super::*;
-
-	pub fn migrate<T: Trait<I>, I: Instance>() {
-		for p in Proposals::<T, I>::get().into_iter() {
-			ProposalOf::<T, I>::migrate_key_from_blake(&p);
-			Voting::<T, I>::migrate_key_from_blake(&p);
-		}
-	}
-}
-
 // Note: this module is not benchmarked. The weights are obtained based on the similarity of the
 // executed logic with other democracy function. Note that councillor operations are assigned to the
 // operational class.
@@ -188,10 +177,6 @@ decl_module! {
 
 		fn deposit_event() = default;
 
-		fn on_runtime_upgrade() {
-			migration::migrate::<T, I>();
-		}
-
 		/// Set the collective's membership.
 		///
 		/// - `new_members`: The new member list. Be nice to the chain and
@@ -550,7 +535,7 @@ mod tests {
 		type Version = ();
 		type ModuleToIndex = ();
 		type AccountData = ();
-		type MigrateAccount = (); type OnNewAccount = ();
+		type OnNewAccount = ();
 		type OnKilledAccount = ();
 	}
 	impl Trait<Instance1> for Test {