Cleanup CFX_SystemHandler.

fpdfsdk/pdfwindow/PWL_ListBox.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef FPDFSDK_PDFWINDOW_PWL_LISTBOX_H_
 #define FPDFSDK_PDFWINDOW_PWL_LISTBOX_H_
 
 #include "fpdfsdk/fxedit/include/fx_edit.h"
@@ skipping 81 matching lines @@
   int32_t GetTopVisibleIndex() const;
   int32_t FindNext(int32_t nIndex, FX_WCHAR nChar) const;
   CFX_FloatRect GetContentRect() const;
   FX_FLOAT GetFirstHeight() const;
   CFX_FloatRect GetListRect() const;
 
   void SetFillerNotify(IPWL_Filler_Notify* pNotify) {
     m_pFillerNotify = pNotify;
   }
 
+  void AttachFFLData(CFFL_FormFiller* pData) { m_pFormFiller = pData; }
+
  protected:
   std::unique_ptr<CFX_ListCtrl> m_pList;
   std::unique_ptr<CPWL_List_Notify> m_pListNotify;
   FX_BOOL m_bMouseDown;
   FX_BOOL m_bHoverSel;
   IPWL_Filler_Notify* m_pFillerNotify;
 
- public:
-  void AttachFFLData(void* pData) { m_pFormFiller = pData; }
-
  private:
-  void* m_pFormFiller;
+  CFFL_FormFiller* m_pFormFiller;  // Not owned.
 };
 
 #endif  // FPDFSDK_PDFWINDOW_PWL_LISTBOX_H_