Re-enable MSVC warning 4800 for compiling with chromium_code

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>
 
@@ skipping 754 matching lines @@
     }
   }
 
   CPDF_Stream* pStream = new CPDF_Stream(pData, len, pDict);
   streamStartPos = m_Pos;
   FXSYS_memset(m_WordBuffer, 0, kEndObjStr.GetLength() + 1);
 
   GetNextWordInternal(nullptr);
 
   int numMarkers = ReadEOLMarkers(m_Pos);
-  if (m_WordSize == kEndObjStr.GetLength() && numMarkers != 0 &&
+  if (m_WordSize == static_cast<unsigned int>(kEndObjStr.GetLength()) &&
+      numMarkers != 0 &&
       FXSYS_memcmp(m_WordBuffer, kEndObjStr.GetPtr(), kEndObjStr.GetLength()) ==
           0) {
     m_Pos = streamStartPos;
   }
   return pStream;
 }
 
 void CPDF_SyntaxParser::InitParser(IFX_FileRead* pFileAccess,
                                    FX_DWORD HeaderOffset) {
   FX_Free(m_pFileBuf);
@@ skipping 194 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);
 }