device: Cleanup class/struct forward declarations

device/bluetooth/bluetooth_remote_gatt_service.h

 // 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.
 
 #ifndef DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_SERVICE_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_SERVICE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "device/bluetooth/bluetooth_export.h"
 #include "device/bluetooth/bluetooth_gatt_service.h"
 
 namespace device {
 
 class BluetoothDevice;
 class BluetoothRemoteGattCharacteristic;
-class BluetoothRemoteGattDescriptor;
 
 // BluetoothRemoteGattService represents a remote GATT service.
 //
 // Instances of the BluetoothRemoteGATTService class are used to represent GATT
 // attribute hierarchies that have been received from a
 // remote Bluetooth GATT peripheral. Such BluetoothRemoteGattService instances
 // are constructed and owned by a BluetoothDevice.
 //
 // Note: We use virtual inheritance on the GATT service since it will be
 // inherited by platform specific versions of the GATT service classes also. The
@@ skipping 24 matching lines @@
  protected:
   BluetoothRemoteGattService();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BluetoothRemoteGattService);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_SERVICE_H_