Re-enable MSVC warning 4800 for compiling with chromium_code

core/src/fxcrt/fx_basic_wstring.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 <stddef.h>
 
 #include <algorithm>
 #include <cctype>
@@ skipping 187 matching lines @@
   ConcatInPlace(str.GetLength(), str.GetPtr());
   return *this;
 }
 bool CFX_WideString::Equal(const wchar_t* ptr) const {
   if (!m_pData) {
     return !ptr || ptr[0] == L'\0';
   }
   if (!ptr) {
     return m_pData->m_nDataLength == 0;
   }
-  return wcslen(ptr) == m_pData->m_nDataLength &&
+  return wcslen(ptr) == static_cast<size_t>(m_pData->m_nDataLength) &&
          wmemcmp(ptr, m_pData->m_String, m_pData->m_nDataLength) == 0;
 }
 bool CFX_WideString::Equal(const CFX_WideStringC& str) const {
   if (!m_pData) {
     return str.IsEmpty();
   }
   return str.GetLength() == m_pData->m_nDataLength &&
          wmemcmp(str.GetPtr(), m_pData->m_String, m_pData->m_nDataLength) == 0;
 }
 bool CFX_WideString::Equal(const CFX_WideString& other) const {
@@ skipping 822 matching lines @@
   int dest_len =
       FXSYS_MultiByteToWideChar(codepage, 0, bstr, src_len, nullptr, 0);
   CFX_WideString wstr;
   if (dest_len) {
     FX_WCHAR* dest_buf = wstr.GetBuffer(dest_len);
     FXSYS_MultiByteToWideChar(codepage, 0, bstr, src_len, dest_buf, dest_len);
     wstr.ReleaseBuffer(dest_len);
   }
   return wstr;
 }