Remove CFX_ThreadLock (its a no-op)

xfa/src/fgas/src/font/fx_gdifont.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 XFA_SRC_FGAS_SRC_FONT_FX_GDIFONT_H_
 #define XFA_SRC_FGAS_SRC_FONT_FX_GDIFONT_H_
 
 #ifdef _FXPLUS
 #if _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN32_MOBILE_ || \
     _FX_OS_ == _FX_WIN64_
 typedef struct _FX_GDIGOCACHE {
   GLYPHMETRICS gm;
   uint8_t* pOutline;
 } FX_GDIGOCACHE, *FX_LPGDIGOCACHE;
 typedef FX_GDIGOCACHE const* FX_LPCGDIGOCACHE;
 class CFX_GdiFontCache {
  public:
   CFX_GdiFontCache();
   ~CFX_GdiFontCache();
   void SetCachedGlyphOutline(FX_DWORD dwGlyph,
                              const GLYPHMETRICS& gm,
                              uint8_t* pOutline);
   FX_LPCGDIGOCACHE GetCachedGlyphOutline(FX_DWORD dwGlyph) const;
 
  protected:
   CFX_MapPtrToPtr m_GlyphMap;
 };
-class CFX_GdiFont : public IFX_Font, public CFX_ThreadLock {
+class CFX_GdiFont : public IFX_Font {
  public:
   CFX_GdiFont(IFX_FontMgr* pFontMgr);
   ~CFX_GdiFont();
   virtual void Release();
   virtual IFX_Font* Retain();
   FX_BOOL LoadFont(const FX_WCHAR* pszFontFamily,
                    FX_DWORD dwFontStyles,
                    FX_WORD wCodePage);
   FX_BOOL LoadFont(const uint8_t* pBuffer, int32_t iLength);
   FX_BOOL LoadFont(const FX_WCHAR* pszFileName);
@@ skipping 58 matching lines @@
                          int32_t iHeight,
                          uint8_t* pOutline,
                          FX_DWORD* pDIB,
                          FX_ARGB argb);
   friend class CFX_GdiFontMgr;
 };
 #endif
 #endif
 
 #endif  // XFA_SRC_FGAS_SRC_FONT_FX_GDIFONT_H_