Remove Release() from IFX_CharIter, use unique_ptrs.

xfa/fee/fx_wordbreak/fx_wordbreak.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_FX_WORDBREAK_FX_WORDBREAK_H_
 #define XFA_FEE_FX_WORDBREAK_FX_WORDBREAK_H_
 
+#include <memory>
+
 #include "core/fxcrt/include/fx_string.h"
 #include "core/fxcrt/include/fx_system.h"
 #include "xfa/fee/ifde_txtedtengine.h"
 
 class CFX_CharIter : public IFX_CharIter {
  public:
-  CFX_CharIter(const CFX_WideString& wsText);
-  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();
+  explicit CFX_CharIter(const CFX_WideString& wsText);
+  ~CFX_CharIter() override;
 
- protected:
-  ~CFX_CharIter();
+  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:
   const CFX_WideString& m_wsText;
   int32_t m_nIndex;
 };
+
 class CFX_WordBreak {
  public:
   CFX_WordBreak();
+  ~CFX_WordBreak();
 
-  void Release();
   void Attach(IFX_CharIter* pIter);
   void Attach(const CFX_WideString& wsText);
   FX_BOOL Next(FX_BOOL bPrev);
   void SetAt(int32_t nIndex);
   int32_t GetWordPos() const;
   int32_t GetWordLength() const;
   void GetWord(CFX_WideString& wsWord) const;
   FX_BOOL IsEOF(FX_BOOL bTail) const;
 
  protected:
-  ~CFX_WordBreak();
   FX_BOOL FindNextBreakPos(IFX_CharIter* pIter,
                            FX_BOOL bPrev,
                            FX_BOOL bFromNext = TRUE);
 
  private:
-  IFX_CharIter* m_pPreIter;
-  IFX_CharIter* m_pCurIter;
+  std::unique_ptr<IFX_CharIter> m_pPreIter;
+  std::unique_ptr<IFX_CharIter> m_pCurIter;
 };
 
 #endif  // XFA_FEE_FX_WORDBREAK_FX_WORDBREAK_H_