Make down-conversion explicit from CFX_Widetring to CFX_WideStringC.

xfa/fxfa/parser/xfa_script_signaturepseudomodel.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/parser/xfa_script_signaturepseudomodel.h"
 
 #include "xfa/fxfa/app/xfa_ffnotify.h"
 #include "xfa/fxfa/fm2js/xfa_fm2jsapi.h"
@@ skipping 57 matching lines @@
   }
   if (iLength >= 2) {
     CFX_ByteString bsExpression = pArguments->GetUTF8String(1);
     wsExpression =
         CFX_WideString::FromUTF8(bsExpression, bsExpression.GetLength());
   }
   if (iLength >= 3) {
     CFX_ByteString bsXMLIdent = pArguments->GetUTF8String(2);
     wsXMLIdent = CFX_WideString::FromUTF8(bsXMLIdent, bsXMLIdent.GetLength());
   }
-  FX_BOOL bSign = pNotify->GetDocProvider()->Sign(hDoc, pNodeList, wsExpression,
-                                                  wsXMLIdent);
+  FX_BOOL bSign = pNotify->GetDocProvider()->Sign(hDoc, pNodeList,
+                                                  wsExpression.AsWideStringC(),
+                                                  wsXMLIdent.AsWideStringC());
   FXJSE_HVALUE hValue = pArguments->GetReturnValue();
   if (hValue) {
     FXJSE_Value_SetBoolean(hValue, bSign);
   }
 }
 void CScript_SignaturePseudoModel::Script_SignaturePseudoModel_Enumerate(
     CFXJSE_Arguments* pArguments) {
   int32_t iLength = pArguments->GetLength();
   if (iLength != 0) {
     ThrowScriptErrorMessage(XFA_IDS_INCORRECT_NUMBER_OF_METHOD, L"enumerate");
@@ skipping 29 matching lines @@
   }
   if (iLength >= 2) {
     bClear = pArguments->GetInt32(1) == 0 ? FALSE : TRUE;
   }
   FX_BOOL bFlag = pNotify->GetDocProvider()->Clear(hDoc, pNode, bClear);
   FXJSE_HVALUE hValue = pArguments->GetReturnValue();
   if (hValue) {
     FXJSE_Value_SetBoolean(hValue, bFlag);
   }
 }