Use smart pointers for class owned pointers under xfa/fde

xfa/fde/cfde_txtedtpage.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_TXTEDTPAGE_H_
 #define XFA_FDE_CFDE_TXTEDTPAGE_H_
 
+#include <memory>
+#include <vector>
+
 #include "xfa/fde/ifde_txtedtpage.h"
 #include "xfa/fde/ifx_chariter.h"
 
 class CFDE_TxtEdtEngine;
 class CFDE_TxtEdtParag;
 class CFDE_TxtEdtTextSet;
 
 class CFDE_TxtEdtPage : public IFDE_TxtEdtPage {
  public:
   CFDE_TxtEdtPage(CFDE_TxtEdtEngine* pEngine, int32_t nLineIndex);
@@ skipping 33 matching lines @@
                    int32_t index) const override;
   int32_t GetWidth(const FDE_TEXTEDITPIECE* pIdentity,
                    int32_t index) const override;
 
  private:
   void NormalizePt2Rect(CFX_PointF& ptF,
                         const CFX_RectF& rtF,
                         FX_FLOAT fTolerance) const;
 
   std::unique_ptr<IFX_CharIter> m_pIter;
-  CFDE_TxtEdtTextSet* m_pTextSet;
-  CFDE_TxtEdtEngine* m_pEditEngine;
+  std::unique_ptr<CFDE_TxtEdtTextSet> m_pTextSet;
+  CFDE_TxtEdtEngine* const m_pEditEngine;
   CFX_MassArrayTemplate<FDE_TEXTEDITPIECE> m_PieceMassArr;
   CFDE_TxtEdtParag* m_pBgnParag;
   CFDE_TxtEdtParag* m_pEndParag;
   int32_t m_nRefCount;
   int32_t m_nPageStart;
   int32_t m_nCharCount;
   int32_t m_nPageIndex;
   FX_BOOL m_bLoaded;
   CFX_RectF m_rtPage;
   CFX_RectF m_rtPageMargin;
   CFX_RectF m_rtPageContents;
   CFX_RectF m_rtPageCanvas;
-  int32_t* m_pCharWidth;
+  std::vector<int32_t> m_CharWidths;
 };
 
 #endif  // XFA_FDE_CFDE_TXTEDTPAGE_H_