use unique_ptr in fpdf_font_cid.cpp

core/fpdfapi/font/cpdf_cidfont.h

 // Copyright 2016 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 CORE_FPDFAPI_FONT_CPDF_CIDFONT_H_
 #define CORE_FPDFAPI_FONT_CPDF_CIDFONT_H_
 
 #include <memory>
 #include <vector>
 
 #include "core/fpdfapi/font/cpdf_font.h"
+#include "core/fxcrt/cfx_maybe_owned.h"
 #include "core/fxcrt/fx_string.h"
 #include "core/fxcrt/fx_system.h"
 
 enum CIDSet {
   CIDSET_UNKNOWN,
   CIDSET_GB1,
   CIDSET_CNS1,
   CIDSET_JAPAN1,
   CIDSET_KOREA1,
   CIDSET_UNICODE,
@@ skipping 40 matching lines @@
  protected:
   void LoadGB2312();
   int GetGlyphIndex(uint32_t unicodeb, bool* pVertGlyph);
   int GetVerticalGlyph(int index, bool* pVertGlyph);
   void LoadMetricsArray(CPDF_Array* pArray,
                         std::vector<uint32_t>* result,
                         int nElements);
   void LoadSubstFont();
   FX_WCHAR GetUnicodeFromCharCode(uint32_t charcode) const;
 
-  CPDF_CMap* m_pCMap;
-  std::unique_ptr<CPDF_CMap> m_pAllocatedCMap;
+  CFX_MaybeOwned<CPDF_CMap> m_pCMap;
   CPDF_CID2UnicodeMap* m_pCID2UnicodeMap;
   CIDSet m_Charset;
   bool m_bType1;
   bool m_bCIDIsGID;
   uint16_t m_DefaultWidth;
   std::unique_ptr<CPDF_StreamAcc> m_pStreamAcc;
   bool m_bAnsiWidthsFixed;
   FX_RECT m_CharBBox[256];
   std::vector<uint32_t> m_WidthList;
   short m_DefaultVY;
   short m_DefaultW1;
   std::vector<uint32_t> m_VertMetrics;
   bool m_bAdobeCourierStd;
   std::unique_ptr<CFX_CTTGSUBTable> m_pTTGSUBTable;
 };
 
 #endif  // CORE_FPDFAPI_FONT_CPDF_CIDFONT_H_