Convert FWL_ERR into an enum class.

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"
 
 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();
-  virtual FWL_ERR GetClassName(CFX_WideString& wsClass) const;
+  virtual FWL_Error GetClassName(CFX_WideString& wsClass) const;
   virtual uint32_t GetClassID() const;
-  virtual FWL_ERR Initialize();
-  virtual FWL_ERR Finalize();
-  virtual FWL_ERR GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE);
-  virtual FWL_ERR Update();
-  virtual FWL_ERR DrawWidget(CFX_Graphics* pGraphics,
-                             const CFX_Matrix* pMatrix = NULL);
+  virtual FWL_Error Initialize();
+  virtual FWL_Error Finalize();
+  virtual FWL_Error GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE);
+  virtual FWL_Error Update();
+  virtual FWL_Error DrawWidget(CFX_Graphics* pGraphics,
+                               const CFX_Matrix* pMatrix = NULL);
 
  protected:
   void DrawBkground(CFX_Graphics* pGraphics,
                     IFWL_ThemeProvider* pTheme,
                     const CFX_Matrix* pMatrix = NULL);
   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;
   friend class CFWL_PictureBoxImpDelegate;
 };
+
 class CFWL_PictureBoxImpDelegate : public CFWL_WidgetImpDelegate {
  public:
   CFWL_PictureBoxImpDelegate(CFWL_PictureBoxImp* pOwner);
-  FWL_ERR OnDrawWidget(CFX_Graphics* pGraphics,
-                       const CFX_Matrix* pMatrix = NULL) override;
+  void OnDrawWidget(CFX_Graphics* pGraphics,
+                    const CFX_Matrix* pMatrix = NULL) override;
 
  protected:
   CFWL_PictureBoxImp* m_pOwner;
 };
 
 #endif  // XFA_FWL_BASEWIDGET_FWL_PICTUREBOXIMP_H_