Use smart pointers for class owned pointers

xfa/fwl/basewidget/fwl_editimp.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_EDITIMP_H_
 #define XFA_FWL_BASEWIDGET_FWL_EDITIMP_H_
 
 #include <deque>
@@ skipping 134 matching lines @@
                         FX_FLOAT fOffSetX,
                         FX_FLOAT fOffSetY);
   int32_t GetWordAtPoint(CFX_PointF pointf, int32_t& nCount);
 
   CFX_RectF m_rtClient;
   CFX_RectF m_rtEngine;
   CFX_RectF m_rtStatic;
   FX_FLOAT m_fVAlignOffset;
   FX_FLOAT m_fScrollOffsetX;
   FX_FLOAT m_fScrollOffsetY;
-  CFDE_TxtEdtEngine* m_pEdtEngine;
+  std::unique_ptr<CFDE_TxtEdtEngine> m_pEdtEngine;
   FX_BOOL m_bLButtonDown;
   int32_t m_nSelStart;
   int32_t m_nLimit;
   FX_FLOAT m_fSpaceAbove;
   FX_FLOAT m_fSpaceBelow;
   FX_FLOAT m_fFontSize;
   FX_ARGB m_argbSel;
   FX_BOOL m_bSetRange;
   int32_t m_iMin;
   int32_t m_iMax;
@@ skipping 27 matching lines @@
   void OnButtonDblClk(CFWL_MsgMouse* pMsg);
   void OnMouseMove(CFWL_MsgMouse* pMsg);
   void OnKeyDown(CFWL_MsgKey* pMsg);
   void OnChar(CFWL_MsgKey* pMsg);
   FX_BOOL OnScroll(IFWL_ScrollBar* pScrollBar, uint32_t dwCode, FX_FLOAT fPos);
   void DoCursor(CFWL_MsgMouse* pMsg);
   CFWL_EditImp* m_pOwner;
 };
 
 #endif  // XFA_FWL_BASEWIDGET_FWL_EDITIMP_H_