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

core/src/fpdfapi/fpdf_font/fpdf_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/fpdfapi/fpdf_module.h"
 #include "../../../include/fpdfapi/fpdf_page.h"
 #include "../../../include/fpdfapi/fpdf_pageobj.h"
 #include "../../../include/fpdfapi/fpdf_resource.h"
@@ skipping 1023 matching lines @@
     return FALSE;
   }
   if (FXFT_Get_Charmap_Encoding(FXFT_Get_Face_Charmaps(face)[0]) ==
       FXFT_ENCODING_UNICODE) {
     FXFT_Set_Charmap(face, FXFT_Get_Face_Charmaps(face)[1]);
   } else {
     FXFT_Set_Charmap(face, FXFT_Get_Face_Charmaps(face)[0]);
   }
   return TRUE;
 }
-extern FX_WCHAR FT_UnicodeFromCharCode(int encoding, FX_DWORD charcode);
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
 #include "../../fxge/apple/apple_int.h"
 #endif
 int CPDF_Type1Font::GlyphFromCharCodeExt(FX_DWORD charcode) {
   if (charcode > 0xff) {
     return -1;
   }
   int index = m_ExtGID[(uint8_t)charcode];
   if (index == 0xffff) {
     return -1;
@@ skipping 726 matching lines @@
 CPDF_Type3Char::CPDF_Type3Char() {
   m_pForm = NULL;
   m_pBitmap = NULL;
   m_bPageRequired = FALSE;
   m_bColored = FALSE;
 }
 CPDF_Type3Char::~CPDF_Type3Char() {
   delete m_pForm;
   delete m_pBitmap;
 }