Merge delegates into IFWL_* classes.

xfa/fwl/core/ifwl_comboedit.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_FWL_CORE_IFWL_COMBOEDIT_H_
 #define XFA_FWL_CORE_IFWL_COMBOEDIT_H_
 
 #include "xfa/fwl/core/cfwl_widgetimpproperties.h"
 #include "xfa/fwl/core/ifwl_edit.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 
 class IFWL_ComboBox;
 
 class IFWL_ComboEdit : public IFWL_Edit {
  public:
   IFWL_ComboEdit(const IFWL_App* app,
                  const CFWL_WidgetImpProperties& properties,
                  IFWL_Widget* pOuter);
 
+  // IFWL_Edit.
+  void OnProcessMessage(CFWL_Message* pMessage) override;
+
   void ClearSelected();
   void SetSelected();
   void EndCaret();
   void FlagFocus(FX_BOOL bSet);
 
  protected:
   void SetComboBoxFocus(FX_BOOL bSet);
   IFWL_ComboBox* m_pOuter;
-  friend class CFWL_ComboEditImpDelegate;
-};
-
-class CFWL_ComboEditImpDelegate : public CFWL_EditImpDelegate {
- public:
-  CFWL_ComboEditImpDelegate(IFWL_ComboEdit* pOwner);
-  void OnProcessMessage(CFWL_Message* pMessage) override;
-
- protected:
-  IFWL_ComboEdit* m_pOwner;
 };
 
 #endif  // XFA_FWL_CORE_IFWL_COMBOEDIT_H_