Make down-conversion explicit from CFX_Widetring to CFX_WideStringC.

core/fpdfdoc/doc_basic.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 "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
 #include "core/fpdfdoc/doc_utils.h"
 #include "core/include/fpdfdoc/fpdf_doc.h"
@@ skipping 317 matching lines @@
         *csFileName = CFX_WideString::FromLocal(pDict->GetStringBy("Unix"));
       } else {
         return false;
       }
     }
   } else if (m_pObj->IsString()) {
     *csFileName = CFX_WideString::FromLocal(m_pObj->GetString());
   } else {
     return false;
   }
-  *csFileName = DecodeFileName(*csFileName);
+  *csFileName = DecodeFileName(csFileName->AsWideStringC());
   return true;
 }
 
 CPDF_FileSpec::CPDF_FileSpec() {
   m_pObj = new CPDF_Dictionary;
   m_pObj->AsDictionary()->SetAtName("Type", "Filespec");
 }
 
 CFX_WideString CPDF_FileSpec::EncodeFileName(const CFX_WideStringC& filepath) {
   if (filepath.GetLength() <= 1) {
@@ skipping 159 matching lines @@
   bsLbl = bsOrig;
   int nPage = FXSYS_atoi(bsLbl);
   if (nPage > 0 && nPage <= nPages) {
     return nPage;
   }
   return -1;
 }
 int32_t CPDF_PageLabel::GetPageByLabel(const CFX_WideStringC& wsLabel) const {
   return GetPageByLabel(PDF_EncodeText(wsLabel.GetPtr()).AsByteStringC());
 }