Remove dead code found by Scythe.

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 385 matching lines @@
     FXFT_Face                           m_Face;
     CFX_GlyphBitmap*            RenderGlyph(CFX_Font* pFont, FX_DWORD glyph_index, FX_BOOL bFontStyle,
                                         const CFX_AffineMatrix* pMatrix, int dest_width, int anti_alias);
     CFX_GlyphBitmap*            RenderGlyph_Nativetext(CFX_Font* pFont, FX_DWORD glyph_index,
             const CFX_AffineMatrix* pMatrix, int dest_width, int anti_alias);
     CFX_GlyphBitmap*        LookUpGlyphBitmap(CFX_Font* pFont, const CFX_AffineMatrix* pMatrix, CFX_ByteStringC& FaceGlyphsKey,
             FX_DWORD glyph_index, FX_BOOL bFontStyle, int dest_width, int anti_alias);
     CFX_MapByteStringToPtr      m_SizeMap;
     CFX_MapPtrToPtr                     m_PathMap;
     CFX_DIBitmap*           m_pBitmap;
-    void*                   m_pPlatformGraphics;
-    void*                   m_pPlatformBitmap;
-    void*                   m_hDC;
-    void*                   m_hBitmap;
-    void*                   m_hOldBitmap;
-    void*                   m_hGdiFont;
-    void*                   m_hOldGdiFont;
 
     void                                    InitPlatform();
     void                                    DestroyPlatform();
 };
 typedef struct {
     const CFX_GlyphBitmap*      m_pGlyph;
     int                                 m_OriginX, m_OriginY;
     FX_FLOAT                    m_fOriginX, m_fOriginY;
 } FXTEXT_GLYPHPOS;
 FX_RECT FXGE_GetGlyphsBBox(FXTEXT_GLYPHPOS* pGlyphAndPos, int nChars, int anti_alias, FX_FLOAT retinaScaleX = 1.0f, FX_FLOAT retinaScaleY = 1.0f);
 FX_BOOL OutputGlyph(void* dib, int x, int y, CFX_Font* pFont, double font_size,
                     CFX_AffineMatrix* pMatrix, unsigned long glyph_index, unsigned long argb);
 FX_BOOL OutputText(void* dib, int x, int y, CFX_Font* pFont, double font_size,
                    CFX_AffineMatrix* pText_matrix, unsigned short const* text, unsigned long argb);
 class IFX_GSUBTable
 {
 public:
     static IFX_GSUBTable* Create(CFX_Font* pFont);
     virtual ~IFX_GSUBTable() { }
     virtual FX_BOOL GetVerticalGlyph(FX_DWORD glyphnum, FX_DWORD* vglyphnum) = 0;
 };
 
 #endif  // CORE_INCLUDE_FXGE_FX_FONT_H_