Removed unused trait SenderOrigin (#1611)

bridges/bin/rialto-parachain/runtime/src/millau_messages.rs

@@ -22,7 +22,7 @@
 use crate::{OriginCaller, Runtime, RuntimeCall, RuntimeOrigin};
 
 use bp_messages::{
-	source_chain::{SenderOrigin, TargetHeaderChain},
+	source_chain::TargetHeaderChain,
 	target_chain::{ProvedMessages, SourceHeaderChain},
 	InboundLaneData, LaneId, Message, MessageNonce, Parameter as MessagesParameter,
 };
@@ -284,16 +284,6 @@ impl SourceHeaderChain<bp_millau::Balance> for Millau {
 	}
 }
 
-impl SenderOrigin<crate::AccountId> for RuntimeOrigin {
-	fn linked_account(&self) -> Option<crate::AccountId> {
-		match self.caller {
-			crate::OriginCaller::system(frame_system::RawOrigin::Signed(ref submitter)) =>
-				Some(submitter.clone()),
-			_ => None,
-		}
-	}
-}
-
 /// RialtoParachain -> Millau message lane pallet parameters.
 #[derive(RuntimeDebug, Clone, Encode, Decode, PartialEq, Eq, TypeInfo)]
 pub enum RialtoParachainToMillauMessagesParameter {