Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/basewidget/fwl_pictureboximp.h

Index: xfa/fwl/basewidget/fwl_pictureboximp.h
diff --git a/xfa/fwl/basewidget/fwl_pictureboximp.h b/xfa/fwl/basewidget/fwl_pictureboximp.h
index f2e67124f63e39e4a580fb7ce54f716833264574..1389452825fc7c158c95f0f61dc71008af6b7c9f 100644
--- a/xfa/fwl/basewidget/fwl_pictureboximp.h
+++ b/xfa/fwl/basewidget/fwl_pictureboximp.h
@@ -8,6 +8,7 @@
 #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;
@@ -17,20 +18,25 @@ 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 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);
+  ~CFWL_PictureBoxImp() override;
+
+  // CFWL_WidgetImp
+  FWL_ERR GetClassName(CFX_WideString& wsClass) const override;
+  FWL_Type GetClassID() const override { return FWL_Type::PictureBox; }
+  FWL_ERR Initialize() override;
+  FWL_ERR Finalize() override;
+  FWL_ERR GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE) override;
+  FWL_ERR Update() override;
+  FWL_ERR 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 = NULL);
+
   FX_BOOL VStyle(FX_BOOL dwStyle);
   CFX_RectF m_rtClient;
   CFX_RectF m_rtImage;
@@ -38,7 +44,6 @@ class CFWL_PictureBoxImp : public CFWL_WidgetImp {
   FX_BOOL m_bTop;
   FX_BOOL m_bVCenter;
   FX_BOOL m_bButton;
-  friend class CFWL_PictureBoxImpDelegate;
 };
 class CFWL_PictureBoxImpDelegate : public CFWL_WidgetImpDelegate {
  public: