Use smart pointers for class owned pointers

xfa/fwl/basewidget/fwl_monthcalendarimp.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_MONTHCALENDARIMP_H_
 #define XFA_FWL_BASEWIDGET_FWL_MONTHCALENDARIMP_H_
 
+#include <memory>
+
 #include "xfa/fgas/localization/fgas_datetime.h"
 #include "xfa/fwl/core/fwl_widgetimp.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 
 class CFWL_MonthCalendarImpDelegate;
 class CFWL_MsgMouse;
 class CFWL_WidgetImpProperties;
 class IFWL_Widget;
 
 struct FWL_DATEINFO;
@@ skipping 137 matching lines @@
   CFX_RectF m_rtDates;
   CFX_RectF m_rtHSep;
   CFX_RectF m_rtHeadText;
   CFX_RectF m_rtToday;
   CFX_RectF m_rtTodayFlag;
   CFX_RectF m_rtWeekNum;
   CFX_RectF m_rtWeekNumSep;
   CFX_RectF m_rtTemp;
   CFX_WideString m_wsHead;
   CFX_WideString m_wsToday;
-  CFX_DateTime* m_pDateTime;
+  std::unique_ptr<CFX_DateTime> m_pDateTime;
   CFX_ArrayTemplate<FWL_DATEINFO*> m_arrDates;
   int32_t m_iCurYear;
   int32_t m_iCurMonth;
   int32_t m_iYear;
   int32_t m_iMonth;
   int32_t m_iDay;
   int32_t m_iHovered;
   int32_t m_iLBtnPartStates;
   int32_t m_iRBtnPartStates;
   DATE m_dtMin;
@@ skipping 59 matching lines @@
   void OnActivate(CFWL_Message* pMsg);
   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);
   CFWL_MonthCalendarImp* m_pOwner;
 };
 
 #endif  // XFA_FWL_BASEWIDGET_FWL_MONTHCALENDARIMP_H_