https://crash.corp.google.com/browse?q=product.name%3D%27Chrome%27%20AND%20expanded_custom_data.ChromeCrashProto.ptype%3D%27browser%27%20AND%20expanded_custom_data.ChromeCrashProto.magic_signature_1.name%3D%27%5BThreadWatcher%20IO%20hang%5D%20net%3A%3A%60anonymous%20namespace%5C%27%3A%3AGetConnectionAttributes%27

0x00007ffead2eaf3c	(chrome.dll -network_interfaces_win.cc:53 )	net::`anonymous namespace'::GetConnectionAttributes
0x00007ffeac1410b1	(chrome.dll -network_interfaces_win.cc:246 )	net::GetWifiPHYLayerProtocol()
0x00007ffeac177135	(chrome.dll -network_connection.cc:40 )	net::NetworkConnection::OnConnectionTypeChanged(net::NetworkChangeNotifier::ConnectionType)

It appears on Windows QUIC's NetworkConnection's call to get the WiFi PHY type hangs the IO thread.  It also crashes, see Issue 572724.

Can we replace NetworkConnection::connection_type() with a call to NetworkChangeNotifier::GetConnectionType()?
Can we remove the WiFi PHY fetching as it's only used for logging? or if it's necessary, could we move it to another thread?