Extern in .cpp file is a code smell, part 2.

core/src/fxge/ge/fx_ge_font.cpp

 // 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
 
 #include "../../../include/fxge/fx_ge.h"
 #include "../../../include/fxge/fx_freetype.h"
 #include "text_int.h"
 #define EM_ADJUST(em, a) (em == 0 ? (a) : (a)*1000 / em)
-extern void _FPDFAPI_GetInternalFontData(int id1,
-                                         const uint8_t*& data,
-                                         FX_DWORD& size);
 CFX_Font::CFX_Font() {
   m_pSubstFont = NULL;
   m_Face = NULL;
   m_bEmbedded = FALSE;
   m_bVertical = FALSE;
   m_pFontData = NULL;
   m_pFontDataAllocation = NULL;
   m_dwSize = 0;
   m_pGsubData = NULL;
   m_pPlatformFont = NULL;
@@ skipping 316 matching lines @@
 
   if (m_pFont->GetSubstFont() && m_pFont->GetSubstFont()->m_Charset == 2) {
     FX_DWORD index = 0;
     if (FXFT_Select_Charmap(face, FXFT_ENCODING_MS_SYMBOL) == 0)
       index = FXFT_Get_Char_Index(face, charcode);
     if (!index && !FXFT_Select_Charmap(face, FXFT_ENCODING_APPLE_ROMAN))
       return FXFT_Get_Char_Index(face, charcode);
   }
   return charcode;
 }