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

fpdfsdk/src/fxedit/fxet_pageobjs.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/fxedit/fxet_stub.h"
 #include "../../include/fxedit/fx_edit.h"
 #include "../../include/fxedit/fxet_edit.h"
 
 #define FX_EDIT_UNDERLINEHALFWIDTH 0.5f
 #define FX_EDIT_CROSSOUTHALFWIDTH 0.5f
 
-extern CFX_ByteString GetPDFWordString(IFX_Edit_FontMap* pFontMap,
-                                       int32_t nFontIndex,
-                                       FX_WORD Word,
-                                       FX_WORD SubWord);
-
 CPDF_Rect GetUnderLineRect(const CPVT_Word& word) {
   return CPDF_Rect(word.ptWord.x, word.ptWord.y + word.fDescent * 0.5f,
                    word.ptWord.x + word.fWidth,
                    word.ptWord.y + word.fDescent * 0.25f);
 }
 
 CPDF_Rect GetCrossoutRect(const CPVT_Word& word) {
   return CPDF_Rect(word.ptWord.x,
                    word.ptWord.y + (word.fAscent + word.fDescent) * 0.5f +
                        word.fDescent * 0.25f,
@@ skipping 634 matching lines @@
           rcUnderline.left += ptOffset.x;
           rcUnderline.right += ptOffset.x;
           rcUnderline.top += ptOffset.y;
           rcUnderline.bottom += ptOffset.y;
           AddRectToPageObjects(pPageObjects, color, rcUnderline);
         }
       }
     }
   }
 }