Cleanup IFWL_Widget visibility and virtual parameters

xfa/fwl/core/ifwl_form.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_FORM_H_
 #define XFA_FWL_CORE_IFWL_FORM_H_
 
 #include <memory>
@@ skipping 73 matching lines @@
 class IFWL_Form : public IFWL_Widget {
  public:
   IFWL_Form(const IFWL_App* app,
             std::unique_ptr<CFWL_WidgetProperties> properties,
             IFWL_Widget* pOuter);
   ~IFWL_Form() override;
 
   // IFWL_Widget
   FWL_Type GetClassID() const override;
   bool IsInstance(const CFX_WideStringC& wsClass) const override;
-  FWL_Error GetWidgetRect(CFX_RectF& rect, bool bAutoSize = false) override;
-  FWL_Error GetClientRect(CFX_RectF& rect) override;
-  FWL_Error Update() override;
+  void GetWidgetRect(CFX_RectF& rect, bool bAutoSize = false) override;
+  void GetClientRect(CFX_RectF& rect) override;
+  void Update() override;
   FWL_WidgetHit HitTest(FX_FLOAT fx, FX_FLOAT fy) 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;
 
   FWL_FORMSIZE GetFormSize();
   FWL_Error SetFormSize(FWL_FORMSIZE eFormSize);
   IFWL_Widget* DoModal();
   IFWL_Widget* DoModal(uint32_t& dwCommandID);
   FWL_Error EndDoModal();
   FWL_Error SetBorderRegion(CFX_Path* pPath);
@@ skipping 79 matching lines @@
   void OnLButtonUp(CFWL_MsgMouse* pMsg);
   void OnMouseMove(CFWL_MsgMouse* pMsg);
   void OnMouseHover(CFWL_MsgMouse* pMsg);
   void OnMouseLeave(CFWL_MsgMouse* pMsg);
   void OnLButtonDblClk(CFWL_MsgMouse* pMsg);
   void OnWindowMove(CFWL_MsgWindowMove* pMsg);
   void OnClose(CFWL_MsgClose* pMsg);
 };
 
 #endif  // XFA_FWL_CORE_IFWL_FORM_H_