Cleanup CFX_UnicodeEncoding and remove IFX_FontEncoding.

core/include/fxge/fx_font.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_INCLUDE_FXGE_FX_FONT_H_
 #define CORE_INCLUDE_FXGE_FX_FONT_H_
 
 #include <map>
@@ skipping 116 matching lines @@
   void DeleteFace();
 
  protected:
   FX_BOOL m_bEmbedded;
   FX_BOOL m_bVertical;
   void* m_pOwnedStream;
 };
 #define ENCODING_INTERNAL 0
 #define ENCODING_UNICODE 1
 
-class IFX_FontEncoding {
+class CFX_UnicodeEncoding {
  public:
-  virtual ~IFX_FontEncoding() {}
+  explicit CFX_UnicodeEncoding(CFX_Font* pFont);
+  ~CFX_UnicodeEncoding();
 
-  virtual FX_DWORD GlyphFromCharCode(FX_DWORD charcode) = 0;
+  FX_DWORD GlyphFromCharCode(FX_DWORD charcode);
 
-  virtual CFX_WideString UnicodeFromCharCode(FX_DWORD charcode) const = 0;
-
-  virtual FX_DWORD CharCodeFromUnicode(FX_WCHAR Unicode) const = 0;
+ private:
+  // Unowned, not nullptr.
+  CFX_Font* m_pFont;
 };
 
-IFX_FontEncoding* FXGE_CreateUnicodeEncoding(CFX_Font* pFont);
 #define FXFONT_SUBST_MM 0x01
 #define FXFONT_SUBST_GLYPHPATH 0x04
 #define FXFONT_SUBST_CLEARTYPE 0x08
 #define FXFONT_SUBST_TRANSFORM 0x10
 #define FXFONT_SUBST_NONSYMBOL 0x20
 #define FXFONT_SUBST_EXACT 0x40
 #define FXFONT_SUBST_STANDARD 0x80
 class CFX_SubstFont {
  public:
   CFX_SubstFont();
@@ skipping 286 matching lines @@
 class IFX_GSUBTable {
  public:
   static IFX_GSUBTable* Create(CFX_Font* pFont);
   virtual FX_BOOL GetVerticalGlyph(FX_DWORD glyphnum, FX_DWORD* vglyphnum) = 0;
 
  protected:
   virtual ~IFX_GSUBTable() {}
 };
 
 #endif  // CORE_INCLUDE_FXGE_FX_FONT_H_