WeightInfo for Session Pallet (#7136)

* whitelist caller in benchmarks

* remove unused component

* Add benchmark weights

* Remove `weightinfo` for `offences`

substrate/frame/offences/src/lib.rs

@@ -77,8 +77,6 @@ pub trait Trait: frame_system::Trait {
 	/// `on_initialize`.
 	/// Note it's going to be exceeded before we stop adding to it, so it has to be set conservatively.
 	type WeightSoftLimit: Get<Weight>;
-	/// Weight information for extrinsics in this pallet.
-	type WeightInfo: WeightInfo;
 }
 
 decl_storage! {
@@ -111,7 +109,7 @@ decl_event!(
 	pub enum Event {
 		/// There is an offence reported of the given `kind` happened at the `session_index` and
 		/// (kind-specific) time slot. This event is not deposited for duplicate slashes. last
-		/// element indicates of the offence was applied (true) or queued (false) 
+		/// element indicates of the offence was applied (true) or queued (false)
 		/// \[kind, timeslot, applied\].
 		Offence(Kind, OpaqueTimeSlot, bool),
 	}

substrate/frame/offences/src/mock.rs

@@ -132,7 +132,6 @@ impl Trait for Runtime {
 	type IdentificationTuple = u64;
 	type OnOffenceHandler = OnOffenceHandler;
 	type WeightSoftLimit = OffencesWeightSoftLimit;
-	type WeightInfo = ();
 }
 
 mod offences {