Add support for device removal/arrival detection with device type. For now this allows us to detect…

content/browser/system_message_window_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 CONTENT_BROWSER_SYSTEM_MESSAGE_WINDOW_WIN_H_
 #define CONTENT_BROWSER_SYSTEM_MESSAGE_WINDOW_WIN_H_
 
 #include <windows.h>
 
 #include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
 
 class CONTENT_EXPORT SystemMessageWindowWin {
  public:
   SystemMessageWindowWin();
 
   virtual ~SystemMessageWindowWin();
 
-  virtual LRESULT OnDeviceChange(UINT event_type, DWORD data);
+  virtual LRESULT OnDeviceChange(UINT event_type, LPARAM data);
 
  private:
   void Init();
 
   LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
                            WPARAM wparam, LPARAM lparam);
 
   static LRESULT CALLBACK WndProcThunk(HWND hwnd,
                                        UINT message,
                                        WPARAM wparam,
                                        LPARAM lparam) {
     SystemMessageWindowWin* msg_wnd = reinterpret_cast<SystemMessageWindowWin*>(
         GetWindowLongPtr(hwnd, GWLP_USERDATA));
     if (msg_wnd)
       return msg_wnd->WndProc(hwnd, message, wparam, lparam);
     return ::DefWindowProc(hwnd, message, wparam, lparam);
   }
 
   HMODULE instance_;
   HWND window_;
+  class DeviceNotifications;
+  scoped_ptr<DeviceNotifications> device_notifications_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemMessageWindowWin);
 };
 
 #endif  // CONTENT_BROWSER_SYSTEM_MESSAGE_WINDOW_WIN_H_