device: Cleanup class/struct forward declarations

device/bluetooth/bluetooth_adapter_win.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 DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_WIN_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_WIN_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "device/bluetooth/bluetooth_adapter.h"
 #include "device/bluetooth/bluetooth_discovery_session.h"
 #include "device/bluetooth/bluetooth_export.h"
 #include "device/bluetooth/bluetooth_task_manager_win.h"
 
 namespace base {
 class SequencedTaskRunner;
-class Thread;
 }  // namespace base
 
 namespace device {
 
 class BluetoothAdapterWinTest;
 class BluetoothDevice;
 class BluetoothSocketThread;
 
 class DEVICE_BLUETOOTH_EXPORT BluetoothAdapterWin
     : public BluetoothAdapter,
@@ skipping 122 matching lines @@
   // NOTE: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<BluetoothAdapterWin> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothAdapterWin);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_WIN_H_