Split off CPDF_Parser and CPDF_SimpleParser into .h/.cpp files

core/src/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/src/fpdfapi/fpdf_parser/cpdf_syntax_parser.h"
 
 #include <vector>
 
 #include "core/include/fpdfapi/fpdf_module.h"
 #include "core/include/fpdfapi/fpdf_parser.h"
 #include "core/include/fxcrt/fx_ext.h"
+#include "core/src/fpdfapi/fpdf_parser/fpdf_parser_utility.h"
 #include "third_party/base/numerics/safe_math.h"
 
 namespace {
 
 struct SearchTagRecord {
   const char* m_pTag;
   FX_DWORD m_Len;
   FX_DWORD m_Offset;
 };
 
@@ skipping 945 matching lines @@
     if (limit && m_Pos == limit)
       return -1;
   }
   return -1;
 }
 
 void CPDF_SyntaxParser::SetEncrypt(
     std::unique_ptr<CPDF_CryptoHandler> pCryptoHandler) {
   m_pCryptoHandler = std::move(pCryptoHandler);
 }