Remove unused CFWL_ListBox code

xfa/fwl/cfwl_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 XFA_FWL_CFWL_COMBOBOX_H_
 #define XFA_FWL_CFWL_COMBOBOX_H_
 
 #include <memory>
@@ skipping 26 matching lines @@
 #define FWL_STYLEEXT_CMB_EditJustified (1L << 8)
 #define FWL_STYLEEXT_CMB_EditDistributed (2L << 8)
 #define FWL_STYLEEXT_CMB_EditHAlignMask (3L << 4)
 #define FWL_STYLEEXT_CMB_EditVAlignMask (3L << 6)
 #define FWL_STYLEEXT_CMB_EditHAlignModeMask (3L << 8)
 #define FWL_STYLEEXT_CMB_ListItemLeftAlign (0L << 10)
 #define FWL_STYLEEXT_CMB_ListItemCenterAlign (1L << 10)
 #define FWL_STYLEEXT_CMB_ListItemRightAlign (2L << 10)
 #define FWL_STYLEEXT_CMB_ListItemAlignMask (3L << 10)
 #define FWL_STYLEEXT_CMB_ListItemText (0L << 12)
-#define FWL_STYLEEXT_CMB_ListItemIconText (1L << 12)
 #define FWL_STYLEEXT_CMB_ReadOnly (1L << 13)
 
 class CFWL_ComboBox : public CFWL_Widget {
  public:
   explicit CFWL_ComboBox(const CFWL_App* pApp);
   ~CFWL_ComboBox() override;
 
   // CFWL_Widget
   FWL_Type GetClassID() const override;
   void ModifyStylesEx(uint32_t dwStylesExAdded,
@@ skipping 105 matching lines @@
   CFWL_ComboBoxProxy* m_pComboBoxProxy;  // Can this be a unique_ptr?
   bool m_bLButtonDown;
   bool m_bUpFormHandler;
   int32_t m_iCurSel;
   int32_t m_iBtnState;
   FX_FLOAT m_fComboFormHandler;
   FX_FLOAT m_fItemHeight;
 };
 
 #endif  // XFA_FWL_CFWL_COMBOBOX_H_