Fix all relative includes to third_party.

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>
 
-#include "../../../third_party/base/nonstd_unique_ptr.h"
 #include "../fxcrt/fx_system.h"
 #include "fx_dib.h"
+#include "third_party/base/nonstd_unique_ptr.h"
 
 typedef struct FT_FaceRec_* FXFT_Face;
 typedef void* FXFT_Library;
 
 class CFX_FaceCache;
 class CFX_FontFaceInfo;
 class CFX_FontMapper;
 class CFX_PathData;
 class CFX_SizeGlyphCache;
 class CFX_SubstFont;
@@ skipping 419 matching lines @@
 
  protected:
   virtual ~IFX_GSUBTable() {}
 };
 
 CFX_ByteString GetNameFromTT(const uint8_t* name_table, FX_DWORD name);
 
 int PDF_GetStandardFontName(CFX_ByteString* name);
 
 #endif  // CORE_INCLUDE_FXGE_FX_FONT_H_