Attempt to remove the where bounds in arithmetic. (#7933)

* Attempt to remove the where bounds.

* Fix further and further.

* Format better.

* Update primitives/npos-elections/src/lib.rs

* fix build

* remove unused

substrate/primitives/npos-elections/src/phragmen.rs

@@ -27,7 +27,7 @@ use crate::{
 use sp_arithmetic::{
 	helpers_128bit::multiply_by_rational,
 	traits::{Bounded, Zero},
-	InnerOf, Rational128,
+	Rational128,
 };
 use sp_std::prelude::*;
 
@@ -68,10 +68,7 @@ pub fn seq_phragmen<AccountId: IdentifierT, P: PerThing128>(
 	initial_candidates: Vec<AccountId>,
 	initial_voters: Vec<(AccountId, VoteWeight, Vec<AccountId>)>,
 	balance: Option<(usize, ExtendedBalance)>,
-) -> Result<ElectionResult<AccountId, P>, crate::Error>
-where
-	ExtendedBalance: From<InnerOf<P>>,
-{
+) -> Result<ElectionResult<AccountId, P>, crate::Error> {
 	let (candidates, voters) = setup_inputs(initial_candidates, initial_voters);
 
 	let (candidates, mut voters) = seq_phragmen_core::<AccountId>(