Removed unused trait SenderOrigin (#1611)

bridges/modules/messages/src/mock.rs

@@ -23,7 +23,7 @@ use bitvec::prelude::*;
 use bp_messages::{
 	source_chain::{
 		LaneMessageVerifier, MessageDeliveryAndDispatchPayment, OnDeliveryConfirmed,
-		OnMessageAccepted, SenderOrigin, TargetHeaderChain,
+		OnMessageAccepted, TargetHeaderChain,
 	},
 	target_chain::{
 		DispatchMessage, MessageDispatch, ProvedLaneMessages, ProvedMessages, SourceHeaderChain,
@@ -185,16 +185,6 @@ impl Config for TestRuntime {
 	type BridgedChainId = TestBridgedChainId;
 }
 
-impl SenderOrigin<AccountId> for RuntimeOrigin {
-	fn linked_account(&self) -> Option<AccountId> {
-		match self.caller {
-			OriginCaller::system(frame_system::RawOrigin::Signed(ref submitter)) =>
-				Some(*submitter),
-			_ => None,
-		}
-	}
-}
-
 impl Size for TestPayload {
 	fn size(&self) -> u32 {
 		16 + self.extra.len() as u32