Remove Release() from IFX_CharIter, use unique_ptrs.

xfa/fee/fde_txtedtbuf.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_TXTEDTBUF_H_
 #define XFA_FEE_FDE_TXTEDTBUF_H_
 
 #include "xfa/fee/ifde_txtedtengine.h"
 #include "xfa/fgas/crt/fgas_memory.h"
 
-class IFX_CharIter;
 class CFDE_TxtEdtBuf;
 
 class CFDE_TxtEdtBufIter : public IFX_CharIter {
  public:
   CFDE_TxtEdtBufIter(CFDE_TxtEdtBuf* pBuf, FX_WCHAR wcAlias = 0);
+  ~CFDE_TxtEdtBufIter() override;
 
-  virtual void Release();
-  virtual FX_BOOL Next(FX_BOOL bPrev = FALSE);
-  virtual FX_WCHAR GetChar();
-  virtual void SetAt(int32_t nIndex);
-  virtual int32_t GetAt() const;
-  virtual FX_BOOL IsEOF(FX_BOOL bTail = TRUE) const;
-  virtual IFX_CharIter* Clone();
-
- protected:
-  ~CFDE_TxtEdtBufIter();
+  FX_BOOL Next(FX_BOOL bPrev = FALSE) override;
+  FX_WCHAR GetChar() override;
+  void SetAt(int32_t nIndex) override;
+  int32_t GetAt() const override;
+  FX_BOOL IsEOF(FX_BOOL bTail = TRUE) const override;
+  IFX_CharIter* Clone() override;
 
  private:
   CFDE_TxtEdtBuf* m_pBuf;
   int32_t m_nCurChunk;
   int32_t m_nCurIndex;
   int32_t m_nIndex;
   FX_WCHAR m_Alias;
 };
+
 class CFDE_TxtEdtBuf {
  public:
   CFDE_TxtEdtBuf();
 
   void Release();
   FX_BOOL SetChunkSize(int32_t nChunkSize);
   int32_t GetChunkSize() const;
   int32_t GetTextLength() const;
   void SetText(const CFX_WideString& wsText);
   void GetText(CFX_WideString& wsText) const;
@@ skipping 30 matching lines @@
 
   int32_t m_nChunkSize;
 
   int32_t m_nTotal;
   FX_BOOL m_bChanged;
   CFX_ArrayTemplate<FDE_CHUNKHEADER*> m_Chunks;
   IFX_MemoryAllocator* m_pAllocator;
 };
 
 #endif  // XFA_FEE_FDE_TXTEDTBUF_H_