Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

fpdfsdk/pdfwindow/PWL_Icon.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 "fpdfsdk/pdfwindow/PWL_Icon.h"
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_stream.h"
@@ skipping 24 matching lines @@
     sAppStream << "q\n";
     sAppStream << rcPlate.left << " " << rcPlate.bottom << " "
                << rcPlate.right - rcPlate.left << " "
                << rcPlate.top - rcPlate.bottom << " re W n\n";
 
     sAppStream << fHScale << " 0 0 " << fVScale << " " << rcPlate.left + fx
                << " " << rcPlate.bottom + fy << " cm\n";
     sAppStream << mt.GetA() << " " << mt.GetB() << " " << mt.GetC() << " "
                << mt.GetD() << " " << mt.GetE() << " " << mt.GetF() << " cm\n";
 
-    sAppStream << "0 g 0 G 1 w /" << sAlias << " Do\n"
+    sAppStream << "0 g 0 G 1 w /" << sAlias.AsByteStringC() << " Do\n"
                << "Q\n";
   }
 
   return sAppStream.GetByteString();
 }
 
 void CPWL_Image::SetPDFStream(CPDF_Stream* pStream) {
   m_pPDFStream = pStream;
 }
 
@@ skipping 160 matching lines @@
   FX_FLOAT fImageFactHeight = fImageHeight * fVScale;
 
   FX_FLOAT fPlateWidth, fPlateHeight;
   CFX_FloatRect rcPlate = GetClientRect();
   fPlateWidth = rcPlate.right - rcPlate.left;
   fPlateHeight = rcPlate.top - rcPlate.bottom;
 
   x = (fPlateWidth - fImageFactWidth) * fLeft;
   y = (fPlateHeight - fImageFactHeight) * fBottom;
 }