Move core/fpdfapi/fpdf_font to core/fpdfapi/font

core/fpdfapi/font/cpdf_truetypefont.h

 // Copyright 2016 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_FPDFAPI_FPDF_FONT_CPDF_TRUETYPEFONT_H_
-#define CORE_FPDFAPI_FPDF_FONT_CPDF_TRUETYPEFONT_H_
+#ifndef CORE_FPDFAPI_FONT_CPDF_TRUETYPEFONT_H_
+#define CORE_FPDFAPI_FONT_CPDF_TRUETYPEFONT_H_
 
-#include "core/fpdfapi/fpdf_font/cpdf_simplefont.h"
+#include "core/fpdfapi/font/cpdf_simplefont.h"
 #include "core/fxcrt/fx_system.h"
 
 class CPDF_TrueTypeFont : public CPDF_SimpleFont {
  public:
   CPDF_TrueTypeFont();
 
   // CPDF_Font:
   bool IsTrueTypeFont() const override;
   const CPDF_TrueTypeFont* AsTrueTypeFont() const override;
   CPDF_TrueTypeFont* AsTrueTypeFont() override;
 
  protected:
   // CPDF_Font:
   bool Load() override;
 
   // CPDF_SimpleFont:
   void LoadGlyphMap() override;
 };
 
-#endif  // CORE_FPDFAPI_FPDF_FONT_CPDF_TRUETYPEFONT_H_
+#endif  // CORE_FPDFAPI_FONT_CPDF_TRUETYPEFONT_H_