device: Cleanup class/struct forward declarations

device/hid/hid_service_win.h

 // Copyright 2014 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_HID_HID_SERVICE_WIN_H_
 #define DEVICE_HID_HID_SERVICE_WIN_H_
 
 #include <windows.h>
 
 // Must be after windows.h.
 #include <hidclass.h>
 
 extern "C" {
 #include <hidsdi.h>
 #include <hidpi.h>
 }
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/scoped_observer.h"
 #include "base/win/scoped_handle.h"
 #include "device/base/device_monitor_win.h"
 #include "device/hid/hid_device_info.h"
 #include "device/hid/hid_service.h"
 
-namespace base {
-namespace win {
-class MessageWindow;
-}
-}
-
 namespace device {
 
 class HidServiceWin : public HidService, public DeviceMonitorWin::Observer {
  public:
   HidServiceWin(scoped_refptr<base::SingleThreadTaskRunner> file_task_runner);
   ~HidServiceWin() override;
 
   void Connect(const HidDeviceId& device_id,
                const ConnectCallback& callback) override;
 
@@ skipping 27 matching lines @@
   scoped_refptr<base::SingleThreadTaskRunner> file_task_runner_;
   ScopedObserver<DeviceMonitorWin, DeviceMonitorWin::Observer> device_observer_;
   base::WeakPtrFactory<HidServiceWin> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HidServiceWin);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_HID_HID_SERVICE_WIN_H_