Cleanup CFX_SystemHandler.

fpdfsdk/pdfwindow/PWL_ComboBox.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_COMBOBOX_H_
 #define FPDFSDK_PDFWINDOW_PWL_COMBOBOX_H_
 
 #include "fpdfsdk/pdfwindow/PWL_Edit.h"
@@ skipping 64 matching lines @@
   void SetSelect(int32_t nItemIndex);
 
   void SetEditSel(int32_t nStartChar, int32_t nEndChar);
   void GetEditSel(int32_t& nStartChar, int32_t& nEndChar) const;
   void Clear();
   void SelectAll();
   FX_BOOL IsPopup() const;
 
   void SetSelectText();
 
-  void AttachFFLData(void* pData) { m_pFormFiller = pData; }
+  void AttachFFLData(CFFL_FormFiller* pData) { m_pFormFiller = pData; }
 
  private:
   void CreateEdit(const PWL_CREATEPARAM& cp);
   void CreateButton(const PWL_CREATEPARAM& cp);
   void CreateListBox(const PWL_CREATEPARAM& cp);
   void SetPopup(FX_BOOL bPopup);
 
   CPWL_CBEdit* m_pEdit;
   CPWL_CBButton* m_pButton;
   CPWL_CBListBox* m_pList;
   FX_BOOL m_bPopup;
   CFX_FloatRect m_rcOldWindow;
   int32_t m_nPopupWhere;
   int32_t m_nSelectItem;
   IPWL_Filler_Notify* m_pFillerNotify;
-
-  void* m_pFormFiller;
+  CFFL_FormFiller* m_pFormFiller;  // Not owned.
 };
 
 #endif  // FPDFSDK_PDFWINDOW_PWL_COMBOBOX_H_