FWL refcounts never incremented (part 2).

xfa/include/fwl/basewidget/fwl_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 _FWL_COMBOBOX_H
 #define _FWL_COMBOBOX_H
 class CFWL_WidgetImpProperties;
 class IFWL_Widget;
@@ skipping 79 matching lines @@
 CFX_Matrix m_matrix;
 int32_t m_index;
 CFX_RectF m_rtItem;
 END_FWL_EVENT_DEF
 class IFWL_ComboBoxDP : public IFWL_ListBoxDP {
  public:
   virtual FX_FLOAT GetListHeight(IFWL_Widget* pWidget) = 0;
 };
 class IFWL_ComboBox : public IFWL_Widget {
  public:
-  IFWL_ComboBox();
-  FWL_ERR Initialize(const CFWL_WidgetImpProperties& properties,
-                     IFWL_Widget* pOuter);
+  static IFWL_ComboBox* Create(const CFWL_WidgetImpProperties& properties);
+
   int32_t GetCurSel();
   FWL_ERR SetCurSel(int32_t iSel);
   FWL_ERR SetEditText(const CFX_WideString& wsText);
   int32_t GetEditTextLength() const;
   FWL_ERR GetEditText(CFX_WideString& wsText,
                       int32_t nStart = 0,
                       int32_t nCount = -1) const;
   FWL_ERR SetEditSelRange(int32_t nStart, int32_t nCount = -1);
   int32_t GetEditSelRange(int32_t nIndex, int32_t& nStart);
   int32_t GetEditLimit();
@@ skipping 13 matching lines @@
   FX_BOOL EditCanSelectAll();
   FX_BOOL EditCopy(CFX_WideString& wsCopy);
   FX_BOOL EditCut(CFX_WideString& wsCut);
   FX_BOOL EditPaste(const CFX_WideString& wsPaste);
   FX_BOOL EditSelectAll();
   FX_BOOL EditDelete();
   FX_BOOL EditDeSelect();
   FWL_ERR GetBBox(CFX_RectF& rect);
   FWL_ERR EditModifyStylesEx(FX_DWORD dwStylesExAdded,
                              FX_DWORD dwStylesExRemoved);
+
+ protected:
+  IFWL_ComboBox();
 };
 #endif