Unused FWL Classes.

xfa/fwl/core/ifwl_custompanel.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_CUSTOMPANEL_H_
-#define XFA_FWL_CORE_IFWL_CUSTOMPANEL_H_
-
-#include "xfa/fwl/core/fwl_widgetimp.h"
-#include "xfa/fwl/core/ifwl_widget.h"
-
-class IFWL_Proxy;
-
-class IFWL_CustomPanel : public IFWL_Widget {
- public:
-  static IFWL_CustomPanel* Create(CFWL_WidgetImpProperties& properties,
-                                  IFWL_Widget* pOuter);
-
-  IFWL_Content* GetContent();
-  FWL_ERR SetContent(IFWL_Content* pContent);
-  FWL_ERR SetProxy(IFWL_Proxy* pProxy);
-
- protected:
-  IFWL_CustomPanel();
-};
-
-#endif  // XFA_FWL_CORE_IFWL_CUSTOMPANEL_H_