Cleanup IFWL_Widget visibility and virtual parameters

xfa/fwl/core/cfwl_widget.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_CFWL_WIDGET_H_
 #define XFA_FWL_CORE_CFWL_WIDGET_H_
 
 #include <memory>
 
 #include "xfa/fwl/core/cfwl_event.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 
 class CFWL_Event;
 class CFWL_Message;
 class CFWL_Widget;
 class CFWL_WidgetDelegate;
 class CFWL_WidgetMgr;
 
 class CFWL_Widget {
  public:
   CFWL_Widget(const IFWL_App*);
   virtual ~CFWL_Widget();
 
   IFWL_Widget* GetWidget();
   const IFWL_Widget* GetWidget() const;
 
-  FWL_Error GetWidgetRect(CFX_RectF& rect, bool bAutoSize = false);
-  FWL_Error SetWidgetRect(const CFX_RectF& rect);
-  FWL_Error GetGlobalRect(CFX_RectF& rect);
-  FWL_Error GetClientRect(CFX_RectF& rtClient);
+  void GetWidgetRect(CFX_RectF& rect, bool bAutoSize = false);
+  void SetWidgetRect(const CFX_RectF& rect);
+  void GetGlobalRect(CFX_RectF& rect);
+  void GetClientRect(CFX_RectF& rtClient);
 
-  FWL_Error ModifyStyles(uint32_t dwStylesAdded, uint32_t dwStylesRemoved);
+  void ModifyStyles(uint32_t dwStylesAdded, uint32_t dwStylesRemoved);
   uint32_t GetStylesEx();
-  FWL_Error ModifyStylesEx(uint32_t dwStylesExAdded,
-                           uint32_t dwStylesExRemoved);
+  void ModifyStylesEx(uint32_t dwStylesExAdded, uint32_t dwStylesExRemoved);
 
   uint32_t GetStates();
   void SetStates(uint32_t dwStates, bool bSet = true);
 
   void SetLayoutItem(void* pItem);
 
   void Update();
   void LockUpdate();
   void UnlockUpdate();
 
   FWL_WidgetHit HitTest(FX_FLOAT fx, FX_FLOAT fy);
 
-  FWL_Error DrawWidget(CFX_Graphics* pGraphics,
-                       const CFX_Matrix* pMatrix = nullptr);
+  void DrawWidget(CFX_Graphics* pGraphics, const CFX_Matrix* pMatrix = nullptr);
 
   IFWL_WidgetDelegate* GetDelegate() const;
   void SetDelegate(IFWL_WidgetDelegate*);
 
  protected:
   void Initialize();
 
   const IFWL_App* m_pApp;
   std::unique_ptr<IFWL_Widget> m_pIface;
   CFWL_WidgetMgr* const m_pWidgetMgr;
 };
 
 #endif  // XFA_FWL_CORE_CFWL_WIDGET_H_