Remove FWL_WGTHITTEST_* defines in favour of enum class.

xfa/fwl/basewidget/fwl_spinbuttonimp.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_BASEWIDGET_FWL_SPINBUTTONIMP_H_
 #define XFA_FWL_BASEWIDGET_FWL_SPINBUTTONIMP_H_
 
 #include "xfa/fwl/core/fwl_widgetimp.h"
 #include "xfa/fwl/core/ifwl_timer.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 
 class CFWL_MsgMouse;
 class CFWL_SpinButtonImpDelegate;
 class CFWL_WidgetImpProperties;
 
 class CFWL_SpinButtonImp : public CFWL_WidgetImp, public IFWL_Timer {
  public:
   CFWL_SpinButtonImp(const CFWL_WidgetImpProperties& properties,
                      IFWL_Widget* pOuter);
   ~CFWL_SpinButtonImp();
   virtual FWL_ERR GetClassName(CFX_WideString& wsClass) const;
   virtual uint32_t GetClassID() const;
   virtual FWL_ERR Initialize();
   virtual FWL_ERR Finalize();
   virtual FWL_ERR GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE);
   virtual FWL_ERR Update();
-  virtual uint32_t HitTest(FX_FLOAT fx, FX_FLOAT fy);
+  virtual FWL_WidgetHit HitTest(FX_FLOAT fx, FX_FLOAT fy);
   virtual FWL_ERR DrawWidget(CFX_Graphics* pGraphics,
                              const CFX_Matrix* pMatrix = NULL);
   virtual int32_t Run(FWL_HTIMER hTimer);
   FWL_ERR EnableButton(FX_BOOL bEnable, FX_BOOL bUp = TRUE);
   FX_BOOL IsButtonEnable(FX_BOOL bUp = TRUE);
 
  protected:
   void DrawUpButton(CFX_Graphics* pGraphics,
                     IFWL_ThemeProvider* pTheme,
                     const CFX_Matrix* pMatrix);
@@ skipping 22 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);
   CFWL_SpinButtonImp* m_pOwner;
 };
 
 #endif  // XFA_FWL_BASEWIDGET_FWL_SPINBUTTONIMP_H_