Cleanup various IFX_ text interfaces.

core/fxge/include/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_FXGE_INCLUDE_FX_FONT_H_
 #define CORE_FXGE_INCLUDE_FX_FONT_H_
 
 #include <map>
@@ skipping 514 matching lines @@
   FX_FLOAT m_fOriginX;
   FX_FLOAT m_fOriginY;
 };
 
 FX_RECT FXGE_GetGlyphsBBox(FXTEXT_GLYPHPOS* pGlyphAndPos,
                            int nChars,
                            int anti_alias,
                            FX_FLOAT retinaScaleX = 1.0f,
                            FX_FLOAT retinaScaleY = 1.0f);
 
-class IFX_GSUBTable {
- public:
-  static IFX_GSUBTable* Create(CFX_Font* pFont);
-  virtual FX_BOOL GetVerticalGlyph(uint32_t glyphnum, uint32_t* vglyphnum) = 0;
-
- protected:
-  virtual ~IFX_GSUBTable() {}
-};
-
 CFX_ByteString GetNameFromTT(const uint8_t* name_table,
                              uint32_t name_table_size,
                              uint32_t name);
 
 int PDF_GetStandardFontName(CFX_ByteString* name);
 
 #endif  // CORE_FXGE_INCLUDE_FX_FONT_H_