dbus: add ObjectPath type

dbus/mock_exported_object.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
 #ifndef DBUS_MOCK_EXPORTED_OBJECT_H_
 #define DBUS_MOCK_EXPORTED_OBJECT_H_
 #pragma once
 
 #include <string>
 
 #include "dbus/exported_object.h"
+#include "dbus/object_path.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace dbus {
 
 // Mock for ExportedObject.
 class MockExportedObject : public ExportedObject {
  public:
   MockExportedObject(Bus* bus,
                      const std::string& service_name,
-                     const std::string& object_path);
+                     const ObjectPath& object_path);
   virtual ~MockExportedObject();
 
   MOCK_METHOD3(ExportMethodAndBlock,
                bool(const std::string& interface_name,
                     const std::string& method_name,
                     MethodCallCallback method_call_callback));
   MOCK_METHOD4(ExportMethod,
                void(const std::string& interface_name,
                     const std::string& method_name,
                     MethodCallCallback method_call_callback,
                     OnExportedCallback on_exported_callback));
   MOCK_METHOD1(SendSignal, void(Signal* signal));
   MOCK_METHOD0(Unregister, void());
 };
 
 }  // namespace dbus
 
 #endif  // DBUS_MOCK_EXPORTED_OBJECT_H_