arc: Use GET_INTERFACE_FOR_METHOD macro

components/arc/kiosk/arc_kiosk_bridge.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/arc/kiosk/arc_kiosk_bridge.h"
 
 #include "components/arc/arc_bridge_service.h"
 
 namespace arc {
 
 ArcKioskBridge::ArcKioskBridge(ArcBridgeService* bridge_service,
                                Delegate* delegate)
     : ArcService(bridge_service), binding_(this), delegate_(delegate) {
   DCHECK(delegate_);
   arc_bridge_service()->kiosk()->AddObserver(this);
 }
 
 ArcKioskBridge::~ArcKioskBridge() {
   arc_bridge_service()->kiosk()->RemoveObserver(this);
 }
 
 void ArcKioskBridge::OnInstanceReady() {
   mojom::KioskInstance* kiosk_instance =
-      arc_bridge_service()->kiosk()->GetInstanceForMethod("Init");
+      GET_INSTANCE_FOR_METHOD(arc_bridge_service()->kiosk(), Init);
   DCHECK(kiosk_instance);
   kiosk_instance->Init(binding_.CreateInterfacePtrAndBind());
 }
 
 void ArcKioskBridge::OnMaintenanceSessionCreated(int32_t session_id) {
   delegate_->OnMaintenanceSessionCreated();
   // TODO(poromov@) Show appropriate splash screen.
 }
 
 void ArcKioskBridge::OnMaintenanceSessionFinished(int32_t session_id,
                                                   bool success) {
   delegate_->OnMaintenanceSessionFinished();
 }
 
 }  // namespace arc