Migrate away from SimpleDispatchInfo (#5686)

* Migrate away from SimpleDispatchInfo

* Fix imports

* Better doc

* Update lib.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

substrate/frame/finality-tracker/src/lib.rs

@@ -23,7 +23,7 @@ use sp_runtime::traits::{One, Zero, SaturatedConversion};
 use sp_std::{prelude::*, result, cmp, vec};
 use frame_support::{decl_module, decl_storage, decl_error, ensure};
 use frame_support::traits::Get;
-use frame_support::weights::{SimpleDispatchInfo, MINIMUM_WEIGHT};
+use frame_support::weights::{MINIMUM_WEIGHT, DispatchClass};
 use frame_system::{ensure_none, Trait as SystemTrait};
 use sp_finality_tracker::{INHERENT_IDENTIFIER, FinalizedInherentData};
 
@@ -77,7 +77,7 @@ decl_module! {
 
 		/// Hint that the author of this block thinks the best finalized
 		/// block is the given number.
-		#[weight = SimpleDispatchInfo::FixedMandatory(MINIMUM_WEIGHT)]
+		#[weight = (MINIMUM_WEIGHT, DispatchClass::Mandatory)]
 		fn final_hint(origin, #[compact] hint: T::BlockNumber) {
 			ensure_none(origin)?;
 			ensure!(!<Self as Store>::Update::exists(), Error::<T>::AlreadyUpdated);
@@ -212,7 +212,9 @@ mod tests {
 		traits::{BlakeTwo256, IdentityLookup, Header as HeaderT},
 	};
 	use frame_support::{
-		assert_ok, impl_outer_origin, parameter_types, weights::Weight, traits::OnFinalize
+		assert_ok, impl_outer_origin, parameter_types,
+		weights::Weight,
+		traits::OnFinalize,
 	};
 	use frame_system as system;
 	use std::cell::RefCell;