Merge the CFWL_*Imp classes into the IFWL_* classes.

xfa/fwl/basewidget/fwl_pictureboximp.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_FWL_BASEWIDGET_FWL_PICTUREBOXIMP_H_
-#define XFA_FWL_BASEWIDGET_FWL_PICTUREBOXIMP_H_
-
-#include "xfa/fwl/core/fwl_widgetimp.h"
-#include "xfa/fwl/core/ifwl_widget.h"
-
-class CFWL_WidgetImpProperties;
-class IFWL_Widget;
-class CFWL_PictureBoxImpDelegate;
-
-class CFWL_PictureBoxImp : public CFWL_WidgetImp {
- public:
-  CFWL_PictureBoxImp(const CFWL_WidgetImpProperties& properties,
-                     IFWL_Widget* pOuter);
-  ~CFWL_PictureBoxImp() override;
-
-  // CFWL_WidgetImp
-  FWL_Error GetClassName(CFX_WideString& wsClass) const override;
-  FWL_Type GetClassID() const override;
-  FWL_Error Initialize() override;
-  FWL_Error Finalize() override;
-  FWL_Error GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE) override;
-  FWL_Error Update() override;
-  FWL_Error DrawWidget(CFX_Graphics* pGraphics,
-                       const CFX_Matrix* pMatrix = nullptr) override;
-
- protected:
-  friend class CFWL_PictureBoxImpDelegate;
-
-  void DrawBkground(CFX_Graphics* pGraphics,
-                    IFWL_ThemeProvider* pTheme,
-                    const CFX_Matrix* pMatrix = nullptr);
-
-  FX_BOOL VStyle(FX_BOOL dwStyle);
-  CFX_RectF m_rtClient;
-  CFX_RectF m_rtImage;
-  CFX_Matrix m_matrix;
-  FX_BOOL m_bTop;
-  FX_BOOL m_bVCenter;
-  FX_BOOL m_bButton;
-};
-
-class CFWL_PictureBoxImpDelegate : public CFWL_WidgetImpDelegate {
- public:
-  CFWL_PictureBoxImpDelegate(CFWL_PictureBoxImp* pOwner);
-  void OnDrawWidget(CFX_Graphics* pGraphics,
-                    const CFX_Matrix* pMatrix = nullptr) override;
-
- protected:
-  CFWL_PictureBoxImp* m_pOwner;
-};
-
-#endif  // XFA_FWL_BASEWIDGET_FWL_PICTUREBOXIMP_H_