Remove useless CPDF_FontCharMap.

core/src/fpdfapi/fpdf_font/font_int.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 CORE_SRC_FPDFAPI_FPDF_FONT_FONT_INT_H_
 #define CORE_SRC_FPDFAPI_FPDF_FONT_FONT_INT_H_
 
 #include <map>
@@ skipping 189 matching lines @@
   CPDF_CID2UnicodeMap* m_pBaseMap;
   CFX_WideTextBuf m_MultiCharBuf;
 
  private:
   friend class fpdf_font_StringToCode_Test;
   friend class fpdf_font_StringToWideString_Test;
 
   static FX_DWORD StringToCode(const CFX_ByteStringC& str);
   static CFX_WideString StringToWideString(const CFX_ByteStringC& str);
 };
-class CPDF_FontCharMap : public CFX_CharMap {
- public:
-  CPDF_FontCharMap(CPDF_Font* pFont);
-  CPDF_Font* m_pFont;
-};
 
 void FPDFAPI_LoadCID2UnicodeMap(CIDSet charset,
                                 const FX_WORD*& pMap,
                                 FX_DWORD& count);
 
 #endif  // CORE_SRC_FPDFAPI_FPDF_FONT_FONT_INT_H_