Use smart pointers for class owned pointers under xfa/fde

xfa/fde/cfde_txtedtengine.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_FDE_CFDE_TXTEDTENGINE_H_
 #define XFA_FDE_CFDE_TXTEDTENGINE_H_
 
+#include <memory>
+
 #include "xfa/fde/ifde_txtedtengine.h"
 
 class CFDE_TxtEdtBuf;
 class CFDE_TxtEdtParag;
 class CFX_TxtBreak;
 class IFDE_TxtEdtDoRecord;
 class IFX_CharIter;
 
 class CFDE_TxtEdtEngine {
  public:
@@ skipping 123 matching lines @@
   void UpdateCaretRect(int32_t nIndex, FX_BOOL bBefore = TRUE);
   void GetCaretRect(CFX_RectF& rtCaret,
                     int32_t nPageIndex,
                     int32_t nCaret,
                     FX_BOOL bBefore = TRUE);
   void UpdateCaretIndex(const CFX_PointF& ptCaret);
 
   FX_BOOL IsSelect();
   void DeleteSelect();
 
-  CFDE_TxtEdtBuf* m_pTxtBuf;
-  CFX_TxtBreak* m_pTextBreak;
+  std::unique_ptr<CFDE_TxtEdtBuf> m_pTxtBuf;
+  std::unique_ptr<CFX_TxtBreak> m_pTextBreak;
   FDE_TXTEDTPARAMS m_Param;
   CFX_ArrayTemplate<IFDE_TxtEdtPage*> m_PagePtrArray;
   CFX_ArrayTemplate<CFDE_TxtEdtParag*> m_ParagPtrArray;
   CFX_ArrayTemplate<FDE_TXTEDTSELRANGE*> m_SelRangePtrArr;
   int32_t m_nPageLineCount;
   int32_t m_nLineCount;
   int32_t m_nAnchorPos;
   int32_t m_nLayoutPos;
   FX_FLOAT m_fCaretPosReserve;
   int32_t m_nCaret;
   FX_BOOL m_bBefore;
   int32_t m_nCaretPage;
   CFX_RectF m_rtCaret;
   uint32_t m_dwFindFlags;
   FX_BOOL m_bLock;
   int32_t m_nLimit;
   FX_WCHAR m_wcAliasChar;
   int32_t m_nFirstLineEnd;
   FX_BOOL m_bAutoLineEnd;
   FX_WCHAR m_wLineEnd;
   FDE_TXTEDT_TEXTCHANGE_INFO m_ChangeInfo;
 };
 
 #endif  // XFA_FDE_CFDE_TXTEDTENGINE_H_