Remove Release() from IFX_CharIter, use unique_ptrs.

xfa/fee/fde_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_FEE_FDE_TXTEDTPAGE_H_
 #define XFA_FEE_FDE_TXTEDTPAGE_H_
 
+#include <memory>
+
 #include "core/fxcrt/include/fx_coordinates.h"
 #include "core/fxcrt/include/fx_string.h"
 #include "xfa/fde/fde_visualset.h"
 #include "xfa/fee/ifde_txtedtpage.h"
 #include "xfa/fgas/crt/fgas_utils.h"
 
 class IFX_CharIter;
 class CFDE_TxtEdtEngine;
 class CFDE_TxtEdtPage;
 class CFDE_TxtEdtParag;
@@ skipping 120 matching lines @@
   int32_t GetWidth(void* pIdentity, int32_t index) const override;
 
  protected:
   virtual ~CFDE_TxtEdtPage();
 
  private:
   void NormalizePt2Rect(CFX_PointF& ptF,
                         const CFX_RectF& rtF,
                         FX_FLOAT fTolerance) const;
 
-  IFX_CharIter* m_pIter;
+  std::unique_ptr<IFX_CharIter> m_pIter;
   CFDE_TxtEdtTextSet* m_pTextSet;
   CFDE_TxtEdtEngine* m_pEditEngine;
   CFDE_TXTEDTPieceMassArray 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;
 };
 
 #endif  // XFA_FEE_FDE_TXTEDTPAGE_H_