Refactor device::BluetoothGattXXX classes to split into remote/local.

device/bluetooth/bluez/bluetooth_gatt_descriptor_bluez.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 "device/bluetooth/bluez/bluetooth_gatt_descriptor_bluez.h"
+
+#include "device/bluetooth/bluez/bluetooth_gatt_characteristic_bluez.h"
+
+namespace bluez {
+
+BluetoothGattDescriptorBlueZ::BluetoothGattDescriptorBlueZ(
+    const dbus::ObjectPath& object_path)
+    : object_path_(object_path) {}
+
+BluetoothGattDescriptorBlueZ::~BluetoothGattDescriptorBlueZ() {}
+
+std::string BluetoothGattDescriptorBlueZ::GetIdentifier() const {
+  return object_path_.value();
+}
+
+}  // namespace bluez