Remove #pragma once from chromeos

chromeos/dbus/bluetooth_property.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_BLUETOOTH_PROPERTY_H_
 #define CHROMEOS_DBUS_BLUETOOTH_PROPERTY_H_
-#pragma once
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "dbus/message.h"
 #include "dbus/object_proxy.h"
 #include "dbus/property.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 
 namespace chromeos {
@@ skipping 35 matching lines @@
   // dbus::PropertySet override.
   //
   // Method connected by ConnectSignals() and called by dbus:: when
   // a property is changed.
   virtual void ChangedReceived(dbus::Signal* signal) OVERRIDE;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_BLUETOOTH_PROPERTY_H_