Make CFX_WideString(const CFX_WideString&) explicit.

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/fpdfdoc/include/fpdf_doc.h"
@@ skipping 297 matching lines @@
     result += filepath.GetAt(1);
     result += ':';
     result += ChangeSlashToPlatform(filepath.c_str() + 2);
     return result;
   }
   CFX_WideString result;
   result += '\\';
   result += ChangeSlashToPlatform(filepath.c_str());
   return result;
 #else
-  return filepath;
+  return CFX_WideString(filepath);
 #endif
 }
 
 bool CPDF_FileSpec::GetFileName(CFX_WideString* csFileName) const {
   if (CPDF_Dictionary* pDict = m_pObj->AsDictionary()) {
     *csFileName = pDict->GetUnicodeTextBy("UF");
     if (csFileName->IsEmpty()) {
       *csFileName =
           CFX_WideString::FromLocal(pDict->GetStringBy("F").AsStringC());
     }
@@ skipping 54 matching lines @@
   return ChangeSlashToPDF(filepath.c_str());
 #elif _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
   if (filepath.Left(sizeof("Mac") - 1) == FX_WSTRC(L"Mac")) {
     CFX_WideString result;
     result = '/';
     result += ChangeSlashToPDF(filepath.c_str());
     return result;
   }
   return ChangeSlashToPDF(filepath.c_str());
 #else
-  return filepath;
+  return CFX_WideString(filepath);
 #endif
 }
 
 void CPDF_FileSpec::SetFileName(const CFX_WideStringC& wsFileName) {
   if (!m_pObj)
     return;
 
   CFX_WideString wsStr = EncodeFileName(wsFileName);
   if (m_pObj->IsString()) {
     m_pObj->SetString(CFX_ByteString::FromUnicode(wsStr));
@@ skipping 116 matching lines @@
   bsLbl = bsOrig;
   int nPage = FXSYS_atoi(bsLbl.c_str());
   if (nPage > 0 && nPage <= nPages) {
     return nPage;
   }
   return -1;
 }
 int32_t CPDF_PageLabel::GetPageByLabel(const CFX_WideStringC& wsLabel) const {
   return GetPageByLabel(PDF_EncodeText(wsLabel.c_str()).AsStringC());
 }