Remove unused CFWL_ListBox code

xfa/fwl/cfwl_listitem.h

 // Copyright 2016 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 XFA_FWL_CFWL_LISTITEM_H_
 #define XFA_FWL_CFWL_LISTITEM_H_
 
 #include "core/fxcrt/fx_coordinates.h"
 #include "core/fxcrt/fx_string.h"
 
-class CFX_DIBitmap;
-
 class CFWL_ListItem {
  public:
   explicit CFWL_ListItem(const CFX_WideString& text);
   ~CFWL_ListItem();
 
   CFX_RectF GetRect() const { return m_rtItem; }
   void SetRect(const CFX_RectF& rect) { m_rtItem = rect; }
 
-  uint32_t GetStyles() const { return m_dwStates; }
-  void SetStyles(uint32_t dwStyle) { m_dwStates = dwStyle; }
-
-  CFX_RectF GetCheckRect() const { return m_rtCheckBox; }
-  void SetCheckRect(const CFX_RectF& rtCheck) { m_rtCheckBox = rtCheck; }
-
-  uint32_t GetStates() const { return GetStyles() | GetCheckState(); }
-
-  uint32_t GetCheckState() const { return m_dwCheckState; }
-  void SetCheckState(uint32_t dwCheckState) { m_dwCheckState = dwCheckState; }
-
-  CFX_DIBitmap* GetIcon() const { return m_pDIB; }
+  uint32_t GetStates() const { return m_dwStates; }
+  void SetStates(uint32_t dwStates) { m_dwStates = dwStates; }
 
   CFX_WideString GetText() const { return m_wsText; }
 
  private:
   CFX_RectF m_rtItem;
   uint32_t m_dwStates;
   CFX_WideString m_wsText;
-  CFX_DIBitmap* m_pDIB;
-  uint32_t m_dwCheckState;
-  CFX_RectF m_rtCheckBox;
 };
 
 #endif  // XFA_FWL_CFWL_LISTITEM_H_