Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

core/fxcrt/fx_basic_buffer.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 <algorithm>
 #include <limits>
 
 #include "core/fxcrt/include/fx_basic.h"
@@ skipping 230 matching lines @@
     m_pStream->WriteBlock(&len, sizeof(int));
     m_pStream->WriteBlock(wstr, len);
   } else {
     m_SavingBuf.AppendBlock(&len, sizeof(int));
     m_SavingBuf.AppendBlock(wstr, len);
   }
   return *this;
 }
 CFX_ArchiveSaver& CFX_ArchiveSaver::operator<<(const CFX_WideString& wstr) {
   CFX_ByteString encoded = wstr.UTF16LE_Encode();
-  return operator<<(encoded);
+  return operator<<(encoded.AsByteStringC());
 }
 void CFX_ArchiveSaver::Write(const void* pData, FX_STRSIZE dwSize) {
   if (m_pStream) {
     m_pStream->WriteBlock(pData, dwSize);
   } else {
     m_SavingBuf.AppendBlock(pData, dwSize);
   }
 }
 CFX_ArchiveLoader::CFX_ArchiveLoader(const uint8_t* pData, uint32_t dwSize) {
   m_pLoadingBuf = pData;
@@ skipping 157 matching lines @@
 }
 
 int32_t CFX_FileBufferArchive::AppendString(const CFX_ByteStringC& lpsz) {
   return AppendBlock(lpsz.GetPtr(), lpsz.GetLength());
 }
 
 void CFX_FileBufferArchive::AttachFile(IFX_StreamWrite* pFile) {
   FXSYS_assert(pFile);
   m_pFile = pFile;
 }