Remove implicit cast from CFX_WideString to (const wchar_t*)

xfa/fxfa/fm2js/xfa_fmparse.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/fxfa/fm2js/xfa_fmparse.h"
 
 #include <memory>
 
@@ skipping 946 matching lines @@
           XFA_FM_KeywordToString(m_pToken->m_type), ws_TempString.c_str());
   }
   int32_t iDirection = 0;
   if (m_pToken->m_type == TOKupto) {
     iDirection = 1;
   } else if (m_pToken->m_type == TOKdownto) {
     iDirection = -1;
   } else {
     CFX_WideString ws_TempString = m_pToken->m_wstring;
     Error(m_pToken->m_uLinenum, FMERR_EXPECTED_TOKEN, L"upto or downto",
-          (const FX_WCHAR*)ws_TempString);
+          ws_TempString.c_str());
   }
   NextToken();
   std::unique_ptr<CXFA_FMSimpleExpression> pAccessor(ParseSimpleExpression());
   std::unique_ptr<CXFA_FMSimpleExpression> pStep;
   if (m_pToken->m_type == TOKstep) {
     NextToken();
     pStep.reset(ParseSimpleExpression());
   }
   Check(TOKdo);
   std::unique_ptr<CXFA_FMExpression> pList(ParseBlockExpression());
@@ skipping 64 matching lines @@
   NextToken();
   e.reset(ParseBlockExpression());
   Check(TOKend);
   if (m_pErrorInfo->message.IsEmpty()) {
     e.reset(new CXFA_FMDoExpression(line, e.release()));
   } else {
     e.reset();
   }
   return e.release();
 }