Convert FWL_ERR into an enum class.

xfa/fwl/basewidget/fwl_barcodeimp.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_BARCODEIMP_H_
 #define XFA_FWL_BASEWIDGET_FWL_BARCODEIMP_H_
 
 #include "xfa/fwl/basewidget/fwl_editimp.h"
 #include "xfa/fwl/basewidget/ifwl_barcode.h"
 #include "xfa/fwl/basewidget/ifwl_scrollbar.h"
 
 class CFWL_WidgetImpProperties;
 class CFWL_BarcodeImpDelegate;
 class CFX_Barcode;
 class IFWL_Widget;
 
 #define XFA_BCS_NeedUpdate 0x0001
 #define XFA_BCS_EncodeSuccess 0x0002
 
 class CFWL_BarcodeImp : public CFWL_EditImp {
  public:
   CFWL_BarcodeImp(const CFWL_WidgetImpProperties& properties,
                   IFWL_Widget* pOuter);
   ~CFWL_BarcodeImp() override;
 
-  FWL_ERR GetClassName(CFX_WideString& wsClass) const override;
+  FWL_Error GetClassName(CFX_WideString& wsClass) const override;
   uint32_t GetClassID() const override;
-  FWL_ERR Initialize() override;
-  FWL_ERR Finalize() override;
-  FWL_ERR Update() override;
-  FWL_ERR DrawWidget(CFX_Graphics* pGraphics,
-                     const CFX_Matrix* pMatrix = nullptr) override;
-  FWL_ERR SetText(const CFX_WideString& wsText) override;
+  FWL_Error Initialize() override;
+  FWL_Error Finalize() override;
+  FWL_Error Update() override;
+  FWL_Error DrawWidget(CFX_Graphics* pGraphics,
+                       const CFX_Matrix* pMatrix = nullptr) override;
+  FWL_Error SetText(const CFX_WideString& wsText) override;
   void SetType(BC_TYPE type);
   FX_BOOL IsProtectedType();
 
  protected:
   friend class CFWL_BarcodeImpDelegate;
 
   void GenerateBarcodeImageCache();
   void CreateBarcodeEngine();
   void ReleaseBarcodeEngine();
 
   CFX_Barcode* m_pBarcodeEngine;
   uint32_t m_dwStatus;
   BC_TYPE m_type;
 };
 
 class CFWL_BarcodeImpDelegate : public CFWL_EditImpDelegate {
  public:
   CFWL_BarcodeImpDelegate(CFWL_BarcodeImp* pOwner);
-  FWL_ERR OnProcessEvent(CFWL_Event* pEvent) override;
+  void OnProcessEvent(CFWL_Event* pEvent) override;
 };
 
 #endif  // XFA_FWL_BASEWIDGET_FWL_BARCODEIMP_H_