Re-enable MSVC warning 4800 for compiling with chromium_code

core/src/fxcrt/fx_basic_buffer.cpp

Index: core/src/fxcrt/fx_basic_buffer.cpp
diff --git a/core/src/fxcrt/fx_basic_buffer.cpp b/core/src/fxcrt/fx_basic_buffer.cpp
index f623d995c783d7a517978b3a11e56e2950435f1a..a3039f4188bd61e032dea4ed9c41f9b78711faa9 100644
--- a/core/src/fxcrt/fx_basic_buffer.cpp
+++ b/core/src/fxcrt/fx_basic_buffer.cpp
@@ -381,7 +381,7 @@ bool CFX_FileBufferArchive::Flush() {
     return false;
   if (!m_pBuffer || !nRemaining)
     return true;
-  return m_pFile->WriteBlock(m_pBuffer.get(), nRemaining);
+  return m_pFile->WriteBlock(m_pBuffer.get(), nRemaining) > 0;
 }
 
 int32_t CFX_FileBufferArchive::AppendBlock(const void* pBuf, size_t size) {