device: Cleanup class/struct forward declarations

device/bluetooth/bluetooth_remote_gatt_characteristic_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_CHARACTERISTIC_WIN_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_CHARACTERISTIC_WIN_H_
 
 #include <memory>
 #include <unordered_map>
 
 #include "base/memory/weak_ptr.h"
 #include "base/sequenced_task_runner.h"
 #include "device/bluetooth/bluetooth_low_energy_defs_win.h"
 #include "device/bluetooth/bluetooth_remote_gatt_characteristic.h"
 #include "device/bluetooth/bluetooth_remote_gatt_service.h"
 
 namespace device {
 
-class BluetoothAdapterWin;
 class BluetoothRemoteGattDescriptorWin;
 class BluetoothRemoteGattServiceWin;
 class BluetoothTaskManagerWin;
 
 // The BluetoothRemoteGattCharacteristicWin class implements
 // BluetoothRemoteGattCharacteristic for remote GATT services on Windows 8 and
 // later.
 class DEVICE_BLUETOOTH_EXPORT BluetoothRemoteGattCharacteristicWin
     : public BluetoothRemoteGattCharacteristic {
  public:
@@ skipping 105 matching lines @@
   // GATT event handle returned by GattEventRegistrationCallback.
   PVOID gatt_event_handle_;
 
   base::WeakPtrFactory<BluetoothRemoteGattCharacteristicWin> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(BluetoothRemoteGattCharacteristicWin);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_CHARACTERISTIC_WIN_H_