arc: Use GET_INTERFACE_FOR_METHOD macro

components/arc/obb_mounter/arc_obb_mounter_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/obb_mounter/arc_obb_mounter_bridge.h"
 
 #include "base/bind.h"
 #include "chromeos/dbus/arc_obb_mounter_client.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "components/arc/arc_bridge_service.h"
@@ skipping 14 matching lines @@
     : ArcService(bridge_service), binding_(this) {
   arc_bridge_service()->obb_mounter()->AddObserver(this);
 }
 
 ArcObbMounterBridge::~ArcObbMounterBridge() {
   arc_bridge_service()->obb_mounter()->RemoveObserver(this);
 }
 
 void ArcObbMounterBridge::OnInstanceReady() {
   mojom::ObbMounterInstance* obb_mounter_instance =
-      arc_bridge_service()->obb_mounter()->GetInstanceForMethod("Init");
+      ARC_GET_INSTANCE_FOR_METHOD(arc_bridge_service()->obb_mounter(), Init);
   DCHECK(obb_mounter_instance);
   obb_mounter_instance->Init(binding_.CreateInterfacePtrAndBind());
 }
 
 void ArcObbMounterBridge::MountObb(const std::string& obb_file,
                                    const std::string& target_path,
                                    int32_t owner_gid,
                                    const MountObbCallback& callback) {
   chromeos::DBusThreadManager::Get()->GetArcObbMounterClient()->MountObb(
       obb_file, target_path, owner_gid, base::Bind(&RunObbCallback, callback));
 }
 
 void ArcObbMounterBridge::UnmountObb(const std::string& target_path,
                                      const UnmountObbCallback& callback) {
   chromeos::DBusThreadManager::Get()->GetArcObbMounterClient()->UnmountObb(
       target_path, base::Bind(&RunObbCallback, callback));
 }
 
 }  // namespace arc