Remove unused list data pointer

xfa/fwl/cfwl_combobox.cpp

 // 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
 
 #include "xfa/fwl/cfwl_combobox.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 144 matching lines @@
     rtTextBk.width -= m_rtBtn.width;
 
     CFWL_ThemeBackground param;
     param.m_pWidget = this;
     param.m_iPart = CFWL_Part::Background;
     param.m_pGraphics = pGraphics;
     if (pMatrix)
       param.m_matrix.Concat(*pMatrix);
     param.m_rtPart = rtTextBk;
 
-    if (m_iCurSel >= 0) {
-      if (void* p = m_pListBox->GetItemData(
-              m_pListBox.get(),
-              m_pListBox->GetItem(m_pListBox.get(), m_iCurSel))) {
-        param.m_pData = p;
-      }
-    }
-
     if (m_pProperties->m_dwStates & FWL_WGTSTATE_Disabled) {
       param.m_dwStates = CFWL_PartState_Disabled;
     } else if ((m_pProperties->m_dwStates & FWL_WGTSTATE_Focused) &&
                (m_iCurSel >= 0)) {
       param.m_dwStates = CFWL_PartState_Selected;
     } else {
       param.m_dwStates = CFWL_PartState_Normal;
     }
     pTheme->DrawBackground(&param);
 
@@ skipping 886 matching lines @@
       else
         iCurSel++;
     }
     m_iCurSel = iCurSel;
     SyncEditText(m_iCurSel);
     return;
   }
   if (m_pEdit)
     m_pEdit->GetDelegate()->OnProcessMessage(pMsg);
 }