Remove implicit cast from CFX_WideString to (const wchar_t*)

xfa/fgas/crt/fgas_stream.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 "xfa/fgas/crt/fgas_stream.h"
 
 #include <algorithm>
 
@@ skipping 370 matching lines @@
   if (m_hFile != NULL) {
     FXSYS_fclose(m_hFile);
   }
 }
 FX_BOOL CFX_FileStreamImp::LoadFile(const FX_WCHAR* pszSrcFileName,
                                     uint32_t dwAccess) {
   FXSYS_assert(m_hFile == NULL);
   FXSYS_assert(pszSrcFileName != NULL && FXSYS_wcslen(pszSrcFileName) > 0);
 #if _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN32_MOBILE_ || \
     _FX_OS_ == _FX_WIN64_
-  CFX_WideString wsMode;
+  const FX_WCHAR* wsMode;
   if (dwAccess & FX_STREAMACCESS_Write) {
     if (dwAccess & FX_STREAMACCESS_Append) {
       wsMode = L"a+b";
     } else if (dwAccess & FX_STREAMACCESS_Truncate) {
       wsMode = L"w+b";
     } else {
       wsMode = L"r+b";
     }
   } else {
     wsMode = L"rb";
@@ skipping 1215 matching lines @@
   return m_pStream->WriteData((const uint8_t*)pData, (int32_t)size) ==
          (int32_t)size;
 }
 FX_BOOL CFGAS_FileWrite::WriteBlock(const void* pData,
                                     FX_FILESIZE offset,
                                     size_t size) {
   m_pStream->Seek(FX_STREAMSEEK_Begin, offset);
   int32_t iLen = m_pStream->WriteData((uint8_t*)pData, (int32_t)size);
   return iLen == (int32_t)size;
 }