Cleanup forward declarations.

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 XFA_INCLUDE_FWL_BASEWIDGET_FWL_COMBOBOX_H_
 #define XFA_INCLUDE_FWL_BASEWIDGET_FWL_COMBOBOX_H_
 
 #include "xfa/include/fwl/basewidget/fwl_listbox.h"
 
 class CFWL_WidgetImpProperties;
-class IFWL_ComboBoxDP;
 class IFWL_ComboBox;
 
 #define FWL_CLASS_ComboBox L"FWL_COMBOBOX"
 #define FWL_CLASSHASH_ComboBox 602353697
 #define FWL_STYLEEXT_CMB_DropList (0L << 0)
 #define FWL_STYLEEXT_CMB_DropDown (1L << 0)
 #define FWL_STYLEEXT_CMB_Sort (1L << 1)
 #define FWL_STYLEEXT_CMB_ListDrag (1L << 2)
 #define FWL_STYLEEXT_CMB_OwnerDraw (1L << 3)
 #define FWL_STYLEEXT_CMB_EditHNear (0L << 4)
@@ skipping 109 matching lines @@
   FX_BOOL EditDeSelect();
   FWL_ERR GetBBox(CFX_RectF& rect);
   FWL_ERR EditModifyStylesEx(FX_DWORD dwStylesExAdded,
                              FX_DWORD dwStylesExRemoved);
 
  protected:
   IFWL_ComboBox();
 };
 
 #endif  // XFA_INCLUDE_FWL_BASEWIDGET_FWL_COMBOBOX_H_