Remove implicit cast from CFX_ByteString to (const char*).

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 402 matching lines @@
           return FALSE;
 
         if (dwAccess & FX_STREAMACCESS_Truncate)
           FX_fsetsize(m_hFile, 0);
       }
     } else {
       return FALSE;
     }
   }
 #else
-  CFX_ByteString wsMode;
+  const FX_CHAR* wsMode = "rb";
   if (dwAccess & FX_STREAMACCESS_Write) {
     if (dwAccess & FX_STREAMACCESS_Append) {
       wsMode = "a+b";
     } else if (dwAccess & FX_STREAMACCESS_Truncate) {
       wsMode = "w+b";
     } else {
       wsMode = "r+b";
     }
-  } else {
-    wsMode = "rb";
   }
   CFX_ByteString szFileName = CFX_ByteString::FromUnicode(pszSrcFileName);
-  m_hFile = FXSYS_fopen(szFileName, wsMode);
+  m_hFile = FXSYS_fopen(szFileName.c_str(), wsMode);
   if (m_hFile == NULL) {
     if (dwAccess & FX_STREAMACCESS_Write) {
       if (dwAccess & FX_STREAMACCESS_Create) {
-        m_hFile = FXSYS_fopen(szFileName, "w+b");
+        m_hFile = FXSYS_fopen(szFileName.c_str(), "w+b");
       }
       if (m_hFile == NULL) {
-        m_hFile = FXSYS_fopen(szFileName, "r+b");
+        m_hFile = FXSYS_fopen(szFileName.c_str(), "r+b");
         if (m_hFile == NULL) {
           return FALSE;
         }
         if (dwAccess & FX_STREAMACCESS_Truncate) {
           FX_fsetsize(m_hFile, 0);
         }
       }
     } else {
       return FALSE;
     }
@@ skipping 1165 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;
 }