Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

core/fxge/ge/fx_ge_ps.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 "core/include/fxge/fx_ge.h"
 
 #include "core/fxge/ge/fx_text_int.h"
 #include "core/include/fxcodec/fx_codec.h"
@@ skipping 662 matching lines @@
   for (int i = 0; i < nChars; i++) {
     int ps_fontnum, ps_glyphindex;
     FindPSFontGlyph(pFaceCache, pFont, pCharPos[i], ps_fontnum, ps_glyphindex);
     if (last_fontnum != ps_fontnum) {
       buf << "/X" << ps_fontnum << " Ff " << font_size << " Fs Sf ";
       last_fontnum = ps_fontnum;
     }
     buf << pCharPos[i].m_OriginX << " " << pCharPos[i].m_OriginY << " m";
     CFX_ByteString hex;
     hex.Format("<%02X>", ps_glyphindex);
-    buf << hex << "Tj\n";
+    buf << hex.AsByteStringC() << "Tj\n";
   }
   buf << "Q\n";
   m_pOutput->OutputPS((const FX_CHAR*)buf.GetBuffer(), buf.GetSize());
   return TRUE;
 }
 void CFX_PSRenderer::WritePSBinary(const uint8_t* data, int len) {
   uint8_t* dest_buf;
   uint32_t dest_size;
   CCodec_ModuleMgr* pEncoders = CFX_GEModule::Get()->GetCodecModule();
   if (pEncoders &&
       pEncoders->GetBasicModule()->A85Encode(data, len, dest_buf, dest_size)) {
     m_pOutput->OutputPS((const FX_CHAR*)dest_buf, dest_size);
     FX_Free(dest_buf);
   } else {
     m_pOutput->OutputPS((const FX_CHAR*)data, len);
   }
 }