Split fwl/core class pt I.

xfa/fwl/core/ifwl_comboboxdp.h

 // Copyright 2016 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_FDE_IFDE_TXTEDTDORECORD_H_
-#define XFA_FDE_IFDE_TXTEDTDORECORD_H_
+#ifndef XFA_FWL_CORE_IFWL_COMBOBOXDP_H_
+#define XFA_FWL_CORE_IFWL_COMBOBOXDP_H_
 
 #include "core/fxcrt/fx_system.h"
+#include "xfa/fwl/core/ifwl_listboxdp.h"
 
-class IFDE_TxtEdtDoRecord {
+class IFWL_Widget;
+
+class IFWL_ComboBoxDP : public IFWL_ListBoxDP {
  public:
-  virtual ~IFDE_TxtEdtDoRecord() {}
-
-  virtual bool Redo() const = 0;
-  virtual bool Undo() const = 0;
+  virtual FX_FLOAT GetListHeight(IFWL_Widget* pWidget) = 0;
 };
 
-#endif  // XFA_FDE_IFDE_TXTEDTDORECORD_H_
+#endif  // XFA_FWL_CORE_IFWL_COMBOBOXDP_H_