Revise IBus related DBus module.

chromeos/dbus/ibus/mock_ibus_engine_factory_service.cc

Index: chromeos/dbus/ibus/mock_ibus_engine_factory_service.cc
diff --git a/chromeos/dbus/ibus/mock_ibus_engine_factory_service.cc b/chromeos/dbus/ibus/mock_ibus_engine_factory_service.cc
index f840e75b88ab730912e586c83adff12b00581360..4660c9f20f91d649bb79e512b7dd147cd140f388 100644
--- a/chromeos/dbus/ibus/mock_ibus_engine_factory_service.cc
+++ b/chromeos/dbus/ibus/mock_ibus_engine_factory_service.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <string>
 #include "chromeos/dbus/ibus/mock_ibus_engine_factory_service.h"
 
 namespace chromeos {
@@ -13,10 +14,12 @@ MockIBusEngineFactoryService::~MockIBusEngineFactoryService() {
 }
 
 void MockIBusEngineFactoryService::SetCreateEngineHandler(
+    const std::string& engine_id,
     const CreateEngineHandler& create_engine_handler) {
 }
 
-void MockIBusEngineFactoryService::UnsetCreateEngineHandler() {
+void MockIBusEngineFactoryService::UnsetCreateEngineHandler(
+    const std::string& engine_id) {
 }
 
 }  // namespace chromeos