Fix ALL the include guards.

core/src/fpdfapi/fpdf_font/font_int.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_SRC_FPDFAPI_FPDF_FONT_FONT_INT_H_
+#define CORE_SRC_FPDFAPI_FPDF_FONT_FONT_INT_H_
 
 typedef void* FXFT_Library;
 class CPDF_CMapManager 
 {
 public:
     CPDF_CMapManager();
     ~CPDF_CMapManager();
     FX_LPVOID                           GetPackage(FX_BOOL bPrompt);
     CPDF_CMap*                          GetPredefinedCMap(const CFX_ByteString& name, FX_BOOL bPrompt);
     CPDF_CID2UnicodeMap*        GetCID2UnicodeMap(int charset, FX_BOOL bPrompt);
@@ skipping 147 matching lines @@
     CFX_CMapDWordToDWord        m_Map;
     CPDF_CID2UnicodeMap*        m_pBaseMap;
     CFX_WideTextBuf                     m_MultiCharBuf;
 };
 class CPDF_FontCharMap : public CFX_CharMap
 {
 public:
     CPDF_FontCharMap(CPDF_Font* pFont);
     CPDF_Font*          m_pFont;
 };
+
+#endif  // CORE_SRC_FPDFAPI_FPDF_FONT_FONT_INT_H_