Remove implicit cast from CFX_WideString to (const wchar_t*)

xfa/fxbarcode/BC_BufferedImageLuminanceSource.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
 // Original code is licensed as follows:
 /*
  * Copyright 2009 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 81 matching lines @@
     const CFX_WideString& filename)
     : CBC_LuminanceSource(0, 0), m_filename(filename) {
   m_height = 0;
   m_width = 0;
   m_bytesPerLine = 0;
   m_top = 0;
   m_left = 0;
 }
 
 void CBC_BufferedImageLuminanceSource::Init(int32_t& e) {
-  IFX_FileRead* fileread = FX_CreateFileRead(m_filename);
+  IFX_FileRead* fileread = FX_CreateFileRead(m_filename.c_str());
   m_pBitmap = CreateDIBSource(fileread);
   if (!m_pBitmap) {
     e = BCExceptionLoadFile;
     return;
   }
   m_pBitmap->ConvertFormat(FXDIB_Argb);
   m_height = m_pBitmap->GetHeight();
   m_width = m_pBitmap->GetWidth();
   m_rgbData.SetSize(m_height * m_width);
   m_bytesPerLine = m_width * 4;
@@ skipping 56 matching lines @@
       int32_t pixel = rgb[offset + x];
       int32_t luminance =
           (306 * ((pixel >> 16) & 0xFF) + 601 * ((pixel >> 8) & 0xFF) +
            117 * (pixel & 0xFF)) >>
           10;
       (*matirx)[offset + x] = (uint8_t)luminance;
     }
   }
   return matirx;
 }