chromeos: Cleanup class/struct fwd declarations

chromeos/dbus/dbus_thread_manager.h

 // 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 CHROMEOS_DBUS_DBUS_THREAD_MANAGER_H_
 #define CHROMEOS_DBUS_DBUS_THREAD_MANAGER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "chromeos/chromeos_export.h"
 
 namespace base {
 class Thread;
 }  // namespace base
 
 namespace dbus {
 class Bus;
-class ObjectPath;
 }  // namespace dbus
 
 namespace chromeos {
 
 // Style Note: Clients are sorted by names.
 class ArcObbMounterClient;
 class AuthPolicyClient;
 class CrasAudioClient;
 class CrosDisksClient;
 class CryptohomeClient;
@@ skipping 167 matching lines @@
   friend class DBusThreadManager;
 
   DBusThreadManagerSetter();
 
   DISALLOW_COPY_AND_ASSIGN(DBusThreadManagerSetter);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_DBUS_THREAD_MANAGER_H_