Refactor fx_font part 4

core/fxge/include/cfx_fontmgr.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_FXGE_INCLUDE_CFX_FONTMGR_H_
 #define CORE_FXGE_INCLUDE_CFX_FONTMGR_H_
 
 #include <map>
 #include <memory>
 
 #include "core/fxge/include/fx_font.h"
 
 class IFX_SystemFontInfo;
 class CFX_FontMapper;
+class CFX_SubstFont;
+class CTTFontDesc;
 
 class CFX_FontMgr {
  public:
   CFX_FontMgr();
   ~CFX_FontMgr();
 
   void InitFTLibrary();
 
   FXFT_Face GetCachedFace(const CFX_ByteString& face_name,
                           int weight,
@@ skipping 31 matching lines @@
   bool FTLibrarySupportsHinting() const { return m_FTLibrarySupportsHinting; }
 
  private:
   std::unique_ptr<CFX_FontMapper> m_pBuiltinMapper;
   std::map<CFX_ByteString, CTTFontDesc*> m_FaceMap;
   FXFT_Library m_FTLibrary;
   bool m_FTLibrarySupportsHinting;
 };
 
 #endif  // CORE_FXGE_INCLUDE_CFX_FONTMGR_H_