Remove implicit cast from CFX_ByteString to (const char*).

xfa/fxfa/app/xfa_ffwidget.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/include/xfa_ffwidget.h"
 
 #include <algorithm>
 
@@ skipping 973 matching lines @@
   CFX_ByteString bsContent;
   uint8_t* pImageBuffer = NULL;
   IFX_FileRead* pImageFileRead = NULL;
   if (wsImage.GetLength() > 0) {
     XFA_ATTRIBUTEENUM iEncoding =
         (XFA_ATTRIBUTEENUM)pImage->GetTransferEncoding();
     if (iEncoding == XFA_ATTRIBUTEENUM_Base64) {
       CFX_ByteString bsData = wsImage.UTF8Encode();
       int32_t iLength = bsData.GetLength();
       pImageBuffer = FX_Alloc(uint8_t, iLength);
-      int32_t iRead = XFA_Base64Decode((const FX_CHAR*)bsData, pImageBuffer);
+      int32_t iRead = XFA_Base64Decode(bsData.c_str(), pImageBuffer);
       if (iRead > 0) {
         pImageFileRead = FX_CreateMemoryStream(pImageBuffer, iRead);
       }
     } else {
       bsContent = CFX_ByteString::FromUnicode(wsImage);
       pImageFileRead = FX_CreateMemoryStream(
           const_cast<uint8_t*>(bsContent.raw_str()), bsContent.GetLength());
     }
   } else {
     CFX_WideString wsURL = wsHref;
@@ skipping 953 matching lines @@
       iType != XFA_ELEMENT_Rectangle) {
     return;
   }
   CXFA_StrokeArray strokes;
   if (!(dwFlags & XFA_DRAWBOX_ForceRound) && iType != XFA_ELEMENT_Arc) {
     box.GetStrokes(strokes);
   }
   XFA_BOX_Fill(box, strokes, pGS, rtWidget, pMatrix, dwFlags);
   XFA_BOX_Stroke(box, strokes, pGS, rtWidget, pMatrix, dwFlags);
 }