Cleanup unused methods and return values in FWL code.

xfa/fwl/core/ifwl_spinbutton.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_SPINBUTTON_H_
 #define XFA_FWL_CORE_IFWL_SPINBUTTON_H_
 
 #include "xfa/fwl/core/cfwl_event.h"
 #include "xfa/fwl/core/ifwl_timer.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 #include "xfa/fxfa/cxfa_eventparam.h"
 
-#define FWL_CLASS_SpinButton L"FWL_SPINBUTTON"
 #define FWL_STYLEEXE_SPB_Vert (1L << 0)
 
 class CFWL_MsgMouse;
 class CFWL_SpinButtonImpDelegate;
 class CFWL_WidgetImpProperties;
 
 FWL_EVENT_DEF(CFWL_EvtSpbClick, CFWL_EventType::Click, FX_BOOL m_bUp;)
 
 class IFWL_SpinButton : public IFWL_Widget, public IFWL_Timer {
  public:
   explicit IFWL_SpinButton(const CFWL_WidgetImpProperties& properties);
   ~IFWL_SpinButton() override;
 
   // IFWL_Widget
-  FWL_Error GetClassName(CFX_WideString& wsClass) const override;
   FWL_Type GetClassID() const override;
   FWL_Error Initialize() override;
-  FWL_Error Finalize() override;
+  void Finalize() override;
   FWL_Error GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE) override;
   FWL_Error Update() override;
   FWL_WidgetHit HitTest(FX_FLOAT fx, FX_FLOAT fy) override;
   FWL_Error DrawWidget(CFX_Graphics* pGraphics,
                        const CFX_Matrix* pMatrix = nullptr) override;
 
   // IFWL_Timer
   void Run(IFWL_TimerInfo* pTimerInfo) override;
 
   FWL_Error EnableButton(FX_BOOL bEnable, FX_BOOL bUp = TRUE);
@@ skipping 31 matching lines @@
   void OnFocusChanged(CFWL_Message* pMsg, FX_BOOL bSet = TRUE);
   void OnLButtonDown(CFWL_MsgMouse* pMsg);
   void OnLButtonUp(CFWL_MsgMouse* pMsg);
   void OnMouseMove(CFWL_MsgMouse* pMsg);
   void OnMouseLeave(CFWL_MsgMouse* pMsg);
   void OnKeyDown(CFWL_MsgKey* pMsg);
   IFWL_SpinButton* m_pOwner;
 };
 
 #endif  // XFA_FWL_CORE_IFWL_SPINBUTTON_H_