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

core/src/fpdftext/fpdf_text.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 "../../../third_party/base/nonstd_unique_ptr.h"
 #include "../../include/fpdfapi/fpdf_page.h"
 #include "../../include/fpdfapi/fpdf_pageobj.h"
 #include "../../include/fpdfapi/fpdf_resource.h"
@@ skipping 765 matching lines @@
   PDF_GetPageText_Unicode(wlines, pDoc, pPage, iMinWidth, flags);
   for (int i = 0; i < wlines.GetSize(); i++) {
     CFX_WideString wstr = wlines[i];
     CFX_ByteString str;
     for (int c = 0; c < wstr.GetLength(); c++) {
       str += CharFromUnicodeAlt(wstr[c], FXSYS_GetACP(), "?");
     }
     lines.Add(str);
   }
 }
-extern void _PDF_GetTextStream_Unicode(CFX_WideTextBuf& buffer,
-                                       CPDF_PageObjects* pPage,
-                                       FX_BOOL bUseLF,
-                                       CFX_PtrArray* pObjArray);
 void PDF_GetTextStream_Unicode(CFX_WideTextBuf& buffer,
                                CPDF_Document* pDoc,
                                CPDF_Dictionary* pPage,
                                FX_DWORD flags) {
   buffer.EstimateSize(0, 10240);
   CPDF_Page page;
   page.Load(pDoc, pPage);
   CPDF_ParseOptions options;
   options.m_bTextOnly = TRUE;
   options.m_bSeparateForm = FALSE;
   page.ParseContent(&options);
-  _PDF_GetTextStream_Unicode(buffer, &page, TRUE, NULL);
+  GetTextStream_Unicode(buffer, &page, TRUE, NULL);
 }