Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

core/fpdfapi/fpdf_parser/cpdf_syntax_parser.cpp

 // Copyright 2016 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/fpdfapi/fpdf_parser/cpdf_syntax_parser.h"
 
 #include <vector>
 
@@ skipping 381 matching lines @@
     FX_FILESIZE SavedPos = m_Pos;
     CFX_ByteString nextword = GetNextWord(&bIsNumber);
     if (bIsNumber) {
       CFX_ByteString nextword2 = GetNextWord(nullptr);
       if (nextword2 == "R") {
         uint32_t objnum = FXSYS_atoui(word);
         return new CPDF_Reference(pObjList, objnum);
       }
     }
     m_Pos = SavedPos;
-    return new CPDF_Number(word);
+    return new CPDF_Number(word.AsByteStringC());
   }
 
   if (word == "true" || word == "false")
     return new CPDF_Boolean(word == "true");
 
   if (word == "null")
     return new CPDF_Null;
 
   if (word == "(") {
     CFX_ByteString str = ReadString();
@@ skipping 101 matching lines @@
 
   if (bIsNumber) {
     FX_FILESIZE SavedPos = m_Pos;
     CFX_ByteString nextword = GetNextWord(&bIsNumber);
     if (bIsNumber) {
       CFX_ByteString nextword2 = GetNextWord(nullptr);
       if (nextword2 == "R")
         return new CPDF_Reference(pObjList, FXSYS_atoui(word));
     }
     m_Pos = SavedPos;
-    return new CPDF_Number(word);
+    return new CPDF_Number(word.AsByteStringC());
   }
 
   if (word == "true" || word == "false")
     return new CPDF_Boolean(word == "true");
 
   if (word == "null")
     return new CPDF_Null;
 
   if (word == "(") {
     CFX_ByteString str = ReadString();
@@ skipping 446 matching lines @@
     if (limit && m_Pos == limit)
       return -1;
   }
   return -1;
 }
 
 void CPDF_SyntaxParser::SetEncrypt(
     std::unique_ptr<IPDF_CryptoHandler> pCryptoHandler) {
   m_pCryptoHandler = std::move(pCryptoHandler);
 }