cleanup: use slices.Equal to simplify code (#8472)

Author: jishudashu

xds/internal/balancer/clusterimpl/clusterimpl.go

@@ -27,6 +27,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"slices"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -128,7 +129,7 @@ type clusterImplBalancer struct {
 // indicating if a new picker needs to be generated.
 func (b *clusterImplBalancer) handleDropAndRequestCountLocked(newConfig *LBConfig) bool {
 	var updatePicker bool
-	if !equalDropCategories(b.dropCategories, newConfig.DropCategories) {
+	if !slices.Equal(b.dropCategories, newConfig.DropCategories) {
 		b.dropCategories = newConfig.DropCategories
 		b.drops = make([]*dropper, 0, len(newConfig.DropCategories))
 		for _, c := range newConfig.DropCategories {

xds/internal/balancer/clusterimpl/config.go

@@ -55,15 +55,3 @@ func parseConfig(c json.RawMessage) (*LBConfig, error) {
 	}
 	return &cfg, nil
 }
-
-func equalDropCategories(a, b []DropConfig) bool {
-	if len(a) != len(b) {
-		return false
-	}
-	for i := range a {
-		if a[i] != b[i] {
-			return false
-		}
-	}
-	return true
-}