device: Cleanup class/struct forward declarations

device/bluetooth/bluetooth_remote_gatt_descriptor_win.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_DESCRIPTOR_WIN_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_DESCRIPTOR_WIN_H_
 
 #include <memory>
 
 #include "base/files/file_path.h"
 #include "base/memory/weak_ptr.h"
 #include "device/bluetooth/bluetooth_low_energy_defs_win.h"
 #include "device/bluetooth/bluetooth_remote_gatt_characteristic.h"
 #include "device/bluetooth/bluetooth_remote_gatt_descriptor.h"
 
 namespace device {
 
-class BluetoothAdapterWin;
 class BluetoothRemoteGattCharacteristicWin;
 class BluetoothTaskManagerWin;
 
 class DEVICE_BLUETOOTH_EXPORT BluetoothRemoteGattDescriptorWin
     : public BluetoothRemoteGattDescriptor {
  public:
   BluetoothRemoteGattDescriptorWin(
       BluetoothRemoteGattCharacteristicWin* parent_characteristic,
       BTH_LE_GATT_DESCRIPTOR* descriptor_info,
       scoped_refptr<base::SequencedTaskRunner>& ui_task_runner);
@@ skipping 28 matching lines @@
   BluetoothUUID descriptor_uuid_;
   std::string descriptor_identifier_;
   std::vector<uint8_t> descriptor_value_;
 
   base::WeakPtrFactory<BluetoothRemoteGattDescriptorWin> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(BluetoothRemoteGattDescriptorWin);
 };
 
 }  // namespace device.
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_DESCRIPTOR_WIN_H_