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

core/src/fpdfapi/fpdf_font/fpdf_font_cid.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_resource.h"
 #include "../../../include/fxge/fx_freetype.h"
@@ skipping 412 matching lines @@
      {0x81, 0xfe}},
     {"KSCpc-EUC",
      CIDSET_KOREA1,
      CIDCODING_KOREA,
      CPDF_CMap::MixedTwoBytes,
      1,
      {0xa1, 0xfd}},
     {"UniKS-UCS2", CIDSET_KOREA1, CIDCODING_UCS2, CPDF_CMap::TwoBytes},
     {"UniKS-UTF16", CIDSET_KOREA1, CIDCODING_UTF16, CPDF_CMap::TwoBytes},
     {NULL, 0, 0}};
-extern void FPDFAPI_FindEmbeddedCMap(const char* name,
-                                     int charset,
-                                     int coding,
-                                     const FXCMAP_CMap*& pMap);
-extern FX_WORD FPDFAPI_CIDFromCharCode(const FXCMAP_CMap* pMap,
-                                       FX_DWORD charcode);
+
 FX_BOOL CPDF_CMap::LoadPredefined(CPDF_CMapManager* pMgr,
                                   const FX_CHAR* pName,
                                   FX_BOOL bPromptCJK) {
   m_PredefinedCMap = pName;
   if (m_PredefinedCMap == FX_BSTRC("Identity-H") ||
       m_PredefinedCMap == FX_BSTRC("Identity-V")) {
     m_Coding = CIDCODING_CID;
     m_bVertical = pName[9] == 'V';
     m_bLoaded = TRUE;
     return TRUE;
@@ skipping 358 matching lines @@
   if (m_pCMap == NULL) {
     return (FX_WORD)charcode;
   }
   return m_pCMap->CIDFromCharCode(charcode);
 }
 FX_BOOL CPDF_CIDFont::IsVertWriting() const {
   return m_pCMap ? m_pCMap->IsVertWriting() : FALSE;
 }
 
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
-extern FX_DWORD FPDFAPI_CharCodeFromCID(const FXCMAP_CMap* pMap, FX_WORD cid);
 static FX_DWORD _EmbeddedCharcodeFromUnicode(const FXCMAP_CMap* pEmbedMap,
                                              int charset,
                                              FX_WCHAR unicode) {
   if (charset <= 0 || charset > 4) {
     return 0;
   }
   CPDF_FontGlobals* pFontGlobals =
       CPDF_ModuleMgr::Get()->GetPageModule()->GetFontGlobals();
   const FX_WORD* pCodes = pFontGlobals->m_EmbeddedToUnicodes[charset].m_pMap;
   if (pCodes == NULL) {
@@ skipping 803 matching lines @@
     if (middlecode > CID) {
       end = middle - 1;
     } else if (middlecode < CID) {
       begin = middle + 1;
     } else {
       return &Japan1_VertCIDs[middle].a;
     }
   }
   return NULL;
 }