Convert FWL_ERR into an enum class.

xfa/fwl/basewidget/fwl_listboximp.h

Index: xfa/fwl/basewidget/fwl_listboximp.h
diff --git a/xfa/fwl/basewidget/fwl_listboximp.h b/xfa/fwl/basewidget/fwl_listboximp.h
index 1dd0db1b4c391cc43ccda2fe12585668d0270737..e995512bfd945c8bebbdf449ff5a4815991ae6cc 100644
--- a/xfa/fwl/basewidget/fwl_listboximp.h
+++ b/xfa/fwl/basewidget/fwl_listboximp.h
@@ -25,23 +25,23 @@ class CFWL_ListBoxImp : public CFWL_WidgetImp {
   CFWL_ListBoxImp(const CFWL_WidgetImpProperties& properties,
                   IFWL_Widget* pOuter);
   ~CFWL_ListBoxImp();
-  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_Error Initialize();
+  virtual FWL_Error Finalize();
+  virtual FWL_Error GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE);
+  virtual FWL_Error Update();
   virtual uint32_t HitTest(FX_FLOAT fx, FX_FLOAT fy);
-  virtual FWL_ERR DrawWidget(CFX_Graphics* pGraphics,
-                             const CFX_Matrix* pMatrix = NULL);
-  virtual FWL_ERR SetThemeProvider(IFWL_ThemeProvider* pThemeProvider);
+  virtual FWL_Error DrawWidget(CFX_Graphics* pGraphics,
+                               const CFX_Matrix* pMatrix = NULL);
+  virtual FWL_Error SetThemeProvider(IFWL_ThemeProvider* pThemeProvider);
   virtual int32_t CountSelItems();
   virtual FWL_HLISTITEM GetSelItem(int32_t nIndexSel);
   virtual int32_t GetSelIndex(int32_t nIndex);
-  virtual FWL_ERR SetSelItem(FWL_HLISTITEM hItem, FX_BOOL bSelect = TRUE);
-  virtual FWL_ERR GetItemText(FWL_HLISTITEM hItem, CFX_WideString& wsText);
-  virtual FWL_ERR GetScrollPos(FX_FLOAT& fPos, FX_BOOL bVert = TRUE);
-  virtual FWL_ERR* Sort(IFWL_ListBoxCompare* pCom);
+  virtual FWL_Error SetSelItem(FWL_HLISTITEM hItem, FX_BOOL bSelect = TRUE);
+  virtual FWL_Error GetItemText(FWL_HLISTITEM hItem, CFX_WideString& wsText);
+  virtual FWL_Error GetScrollPos(FX_FLOAT& fPos, FX_BOOL bVert = TRUE);
+  virtual FWL_Error Sort(IFWL_ListBoxCompare* pCom);
 
  protected:
   FWL_HLISTITEM GetItem(FWL_HLISTITEM hItem, uint32_t dwKeyCode);
@@ -105,9 +105,9 @@ class CFWL_ListBoxImpDelegate : public CFWL_WidgetImpDelegate {
  public:
   CFWL_ListBoxImpDelegate(CFWL_ListBoxImp* pOwner);
   int32_t OnProcessMessage(CFWL_Message* pMessage) override;
-  FWL_ERR OnProcessEvent(CFWL_Event* pEvent) override;
-  FWL_ERR OnDrawWidget(CFX_Graphics* pGraphics,
-                       const CFX_Matrix* pMatrix = NULL) override;
+  FWL_Error OnProcessEvent(CFWL_Event* pEvent) override;
+  FWL_Error OnDrawWidget(CFX_Graphics* pGraphics,
+                         const CFX_Matrix* pMatrix = NULL) override;
 
  protected:
   void OnFocusChanged(CFWL_Message* pMsg, FX_BOOL bSet = TRUE);