Cleanup IFWL_Widget visibility and virtual parameters

xfa/fwl/core/ifwl_barcode.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_BARCODE_H_
 #define XFA_FWL_CORE_IFWL_BARCODE_H_
 
 #include <memory>
@@ skipping 45 matching lines @@
 };
 
 class IFWL_Barcode : public IFWL_Edit {
  public:
   explicit IFWL_Barcode(const IFWL_App* app,
                         std::unique_ptr<CFWL_WidgetProperties> properties);
   ~IFWL_Barcode() override;
 
   // IFWL_Widget
   FWL_Type GetClassID() const override;
-  FWL_Error Update() override;
-  FWL_Error DrawWidget(CFX_Graphics* pGraphics,
-                       const CFX_Matrix* pMatrix = nullptr) override;
+  void Update() override;
+  void DrawWidget(CFX_Graphics* pGraphics,
+                  const CFX_Matrix* pMatrix = nullptr) override;
   FWL_Error SetText(const CFX_WideString& wsText) override;
   void OnProcessEvent(CFWL_Event* pEvent) override;
 
   void SetType(BC_TYPE type);
   bool IsProtectedType();
 
  protected:
   void GenerateBarcodeImageCache();
   void CreateBarcodeEngine();
 
   std::unique_ptr<CFX_Barcode> m_pBarcodeEngine;
   uint32_t m_dwStatus;
   BC_TYPE m_type;
 };
 
 #endif  // XFA_FWL_CORE_IFWL_BARCODE_H_