Fix Wvarargs warning in XFA error code.

xfa/fxfa/fm2js/xfa_lexer.h

 // 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
 
 #ifndef XFA_FXFA_FM2JS_XFA_LEXER_H_
 #define XFA_FXFA_FM2JS_XFA_LEXER_H_
 
 #include <memory>
@@ skipping 101 matching lines @@
                        const FX_WCHAR*& pEnd);
   void Comment(const FX_WCHAR* p, const FX_WCHAR*& pEnd);
   XFA_FM_TOKEN IsKeyword(const CFX_WideStringC& p);
   void SetCurrentLine(uint32_t line) { m_uCurrentLine = line; }
   void SetToken(CXFA_FMToken* pToken) {
     if (m_pToken.get() != pToken)
       m_pToken.reset(pToken);
   }
   const FX_WCHAR* SavePos() { return m_ptr; }
   void RestorePos(const FX_WCHAR* pPos) { m_ptr = pPos; }
-  void Error(XFA_FM_ERRMSG msg, ...);
+  void Error(const FX_WCHAR* msg, ...);
   FX_BOOL HasError() const;
 
  protected:
   CXFA_FMToken* Scan();
 
   const FX_WCHAR* m_ptr;
   uint32_t m_uCurrentLine;
   std::unique_ptr<CXFA_FMToken> m_pToken;
   CXFA_FMErrorInfo* m_pErrorInfo;
 };
 
 #endif  // XFA_FXFA_FM2JS_XFA_LEXER_H_