Remove implicit cast from CFX_WideString to (const wchar_t*)

core/fpdfdoc/doc_formfield.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/cfdf_document.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_number.h"
@@ skipping 706 matching lines @@
   if (bNotify && m_pForm->m_pFormNotify) {
     int iRet = 0;
     if (GetType() == ListBox)
       iRet = m_pForm->m_pFormNotify->BeforeSelectionChange(this, csOptLabel);
     if (GetType() == ComboBox)
       iRet = m_pForm->m_pFormNotify->BeforeValueChange(this, csOptLabel);
     if (iRet < 0)
       return -1;
   }
 
-  CFX_ByteString csStr = PDF_EncodeText(csOptLabel, csOptLabel.GetLength());
+  CFX_ByteString csStr =
+      PDF_EncodeText(csOptLabel.c_str(), csOptLabel.GetLength());
   CPDF_Object* pValue = FPDF_GetFieldAttr(m_pDict, "Opt");
   CPDF_Array* pOpt = ToArray(pValue);
   if (!pOpt) {
     pOpt = new CPDF_Array;
     m_pDict->SetAt("Opt", pOpt);
   }
 
   int iCount = (int)pOpt->GetCount();
   if (index < 0 || index >= iCount) {
     pOpt->AddString(csStr);
@@ skipping 330 matching lines @@
     pFontDict = m_pForm->m_pFormDict->GetDictBy("DR")
                     ->GetDictBy("Font")
                     ->GetDictBy(font_name.AsStringC());
 
   if (!pFontDict) {
     return;
   }
   m_pFont = m_pForm->m_pDocument->LoadFont(pFontDict);
   m_FontSize = FX_atof(syntax.GetWord());
 }