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

core/src/fpdftext/fpdf_text_search.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_pageobj.h"
 #include "../../include/fpdfapi/fpdf_page.h"
+#include "text_int.h"
+
 class CPDF_TextStream {
  public:
   CPDF_TextStream(CFX_WideTextBuf& buffer,
                   FX_BOOL bUseLF,
                   CFX_PtrArray* pObjArray);
   ~CPDF_TextStream() {}
   FX_BOOL ProcessObject(const CPDF_TextObject* pObj, FX_BOOL bFirstLine);
   CFX_WideTextBuf& m_Buffer;
   FX_BOOL m_bUseLF;
   CFX_PtrArray* m_pObjArray;
@@ skipping 307 matching lines @@
     CPDF_PageObject* pObject = page.GetNextObject(pos);
     if (pObject->m_Type != PDFPAGE_TEXT) {
       continue;
     }
     if (textstream.ProcessObject((CPDF_TextObject*)pObject, TRUE)) {
       break;
     }
   }
   return buffer.GetWideString();
 }