Make code compile with clang_use_chrome_plugin (part VI)

xfa/fwl/lightwidget/cfwl_listbox.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/lightwidget/cfwl_listbox.h"
 
 #include <memory>
 
@@ skipping 323 matching lines @@
   return static_cast<CFWL_ListItem*>(pItem)->m_dwCheckState;
 }
 
 FWL_Error CFWL_ListBox::CFWL_ListBoxDP::SetItemCheckState(
     IFWL_Widget* pWidget,
     IFWL_ListItem* pItem,
     uint32_t dwCheckState) {
   static_cast<CFWL_ListItem*>(pItem)->m_dwCheckState = dwCheckState;
   return FWL_Error::Succeeded;
 }
+
+CFWL_ListItem::CFWL_ListItem() {
+  m_rtItem.Reset();
+  m_dwStates = 0;
+  m_wsText = L"";
+  m_pDIB = NULL;
+  m_pData = NULL;
+  m_dwCheckState = 0;
+  m_rtCheckBox.Reset();
+}
+
+CFWL_ListItem::~CFWL_ListItem() {}