Use smart pointers for class owned pointers

xfa/fwl/basewidget/fwl_caretimp.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_CARETIMP_H_
 #define XFA_FWL_BASEWIDGET_FWL_CARETIMP_H_
 
+#include <memory>
+
 #include "xfa/fwl/core/fwl_widgetimp.h"
 #include "xfa/fwl/core/ifwl_timer.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 #include "xfa/fxgraphics/cfx_color.h"
 
 class CFWL_WidgetImpProperties;
 class IFWL_Widget;
 class CFWL_CaretImpDelegate;
 
 class CFWL_CaretImp : public CFWL_WidgetImp {
@@ skipping 24 matching lines @@
     explicit CFWL_CaretTimer(CFWL_CaretImp* pCaret);
     ~CFWL_CaretTimer() override {}
     void Run(IFWL_TimerInfo* hTimer) override;
     CFWL_CaretImp* const m_pCaret;
   };
 
   void DrawCaretBK(CFX_Graphics* pGraphics,
                    IFWL_ThemeProvider* pTheme,
                    const CFX_Matrix* pMatrix);
 
-  CFWL_CaretTimer* m_pTimer;
-  IFWL_TimerInfo* m_pTimerInfo;
+  std::unique_ptr<CFWL_CaretTimer> m_pTimer;
+  IFWL_TimerInfo* m_pTimerInfo;  // not owned.
   uint32_t m_dwElapse;
   CFX_Color m_crFill;
   FX_BOOL m_bSetColor;
 };
 
 class CFWL_CaretImpDelegate : public CFWL_WidgetImpDelegate {
  public:
   CFWL_CaretImpDelegate(CFWL_CaretImp* pOwner);
   void OnProcessMessage(CFWL_Message* pMessage) override;
   void OnDrawWidget(CFX_Graphics* pGraphics,
                     const CFX_Matrix* pMatrix = nullptr) override;
 
  protected:
   CFWL_CaretImp* m_pOwner;
 };
 
 #endif  // XFA_FWL_BASEWIDGET_FWL_CARETIMP_H_