Cleanup IFWL_Widget visibility and virtual parameters

xfa/fwl/core/ifwl_caret.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_CARET_H_
 #define XFA_FWL_CORE_IFWL_CARET_H_
 
 #include <memory>
 
 #include "xfa/fwl/core/ifwl_timer.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 #include "xfa/fxgraphics/cfx_color.h"
 
 class CFWL_WidgetProperties;
 class IFWL_Widget;
 
 #define FWL_STATE_CAT_HightLight 1
 
 class IFWL_Caret : public IFWL_Widget {
  public:
   IFWL_Caret(const IFWL_App* app,
              std::unique_ptr<CFWL_WidgetProperties> properties,
              IFWL_Widget* pOuter);
   ~IFWL_Caret() override;
 
   // IFWL_Widget
   FWL_Type GetClassID() const override;
-  FWL_Error DrawWidget(CFX_Graphics* pGraphics,
-                       const CFX_Matrix* pMatrix = nullptr) override;
+  void DrawWidget(CFX_Graphics* pGraphics,
+                  const CFX_Matrix* pMatrix = nullptr) override;
   void OnProcessMessage(CFWL_Message* pMessage) override;
   void OnDrawWidget(CFX_Graphics* pGraphics,
                     const CFX_Matrix* pMatrix) override;
 
   void ShowCaret(bool bFlag = true);
   FWL_Error GetFrequency(uint32_t& elapse);
   FWL_Error SetFrequency(uint32_t elapse);
   FWL_Error SetColor(CFX_Color crFill);
 
  protected:
@@ skipping 11 matching lines @@
                    const CFX_Matrix* pMatrix);
 
   std::unique_ptr<IFWL_Caret::Timer> m_pTimer;
   IFWL_TimerInfo* m_pTimerInfo;  // not owned.
   uint32_t m_dwElapse;
   CFX_Color m_crFill;
   bool m_bSetColor;
 };
 
 #endif  // XFA_FWL_CORE_IFWL_CARET_H_