Cleanup IFWL_Widget visibility and virtual parameters

xfa/fwl/core/ifwl_picturebox.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_CORE_IFWL_PICTUREBOX_H_
 #define XFA_FWL_CORE_IFWL_PICTUREBOX_H_
 
 #include "xfa/fwl/core/cfwl_widgetproperties.h"
@@ skipping 30 matching lines @@
 };
 
 class IFWL_PictureBox : public IFWL_Widget {
  public:
   explicit IFWL_PictureBox(const IFWL_App* app,
                            std::unique_ptr<CFWL_WidgetProperties> properties);
   ~IFWL_PictureBox() override;
 
   // IFWL_Widget
   FWL_Type GetClassID() const override;
-  FWL_Error GetWidgetRect(CFX_RectF& rect, bool bAutoSize = false) override;
-  FWL_Error Update() override;
-  FWL_Error DrawWidget(CFX_Graphics* pGraphics,
-                       const CFX_Matrix* pMatrix = nullptr) override;
+  void GetWidgetRect(CFX_RectF& rect, bool bAutoSize = false) override;
+  void Update() override;
+  void DrawWidget(CFX_Graphics* pGraphics,
+                  const CFX_Matrix* pMatrix = nullptr) override;
   void OnDrawWidget(CFX_Graphics* pGraphics,
                     const CFX_Matrix* pMatrix) override;
 
  protected:
   void DrawBkground(CFX_Graphics* pGraphics,
                     IFWL_ThemeProvider* pTheme,
                     const CFX_Matrix* pMatrix = nullptr);
   bool VStyle(uint32_t dwStyle);
 
   CFX_RectF m_rtClient;
   CFX_RectF m_rtImage;
   CFX_Matrix m_matrix;
   bool m_bTop;
   bool m_bVCenter;
   bool m_bButton;
 };
 
 #endif  // XFA_FWL_CORE_IFWL_PICTUREBOX_H_