Cleanup forward declarations.

fpdfsdk/include/formfiller/FFL_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 FPDFSDK_INCLUDE_FORMFILLER_FFL_COMBOBOX_H_
 #define FPDFSDK_INCLUDE_FORMFILLER_FFL_COMBOBOX_H_
 
 #include "core/include/fxcrt/fx_string.h"
 #include "fpdfsdk/include/formfiller/FFL_FormFiller.h"
 
 class CBA_FontMap;
-class CPDFSDK_Document;
 
 struct FFL_ComboBoxState {
   int nIndex;
   int nStart;
   int nEnd;
   CFX_WideString sValue;
 };
 
 class CFFL_ComboBox : public CFFL_FormFiller,
                       public IPWL_FocusHandler,
@@ skipping 36 matching lines @@
 #endif  // PDF_ENABLE_XFA
 
  private:
   CFX_WideString GetSelectExportText();
 
   CBA_FontMap* m_pFontMap;
   FFL_ComboBoxState m_State;
 };
 
 #endif  // FPDFSDK_INCLUDE_FORMFILLER_FFL_COMBOBOX_H_