Always use NonBlocking IO for UDP sockets on Windows.

content/browser/renderer_host/p2p/socket_host_udp.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/p2p/socket_host_udp.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 429 matching lines @@
       NOTREACHED();
       return false;
   }
 }
 
 // static
 std::unique_ptr<net::DatagramServerSocket>
 P2PSocketHostUdp::DefaultSocketFactory() {
   net::UDPServerSocket* socket = new net::UDPServerSocket(
       GetContentClient()->browser()->GetNetLog(), net::NetLogSource());
-#if defined(OS_WIN)
-  socket->UseNonBlockingIO();
-#endif
 
   return base::WrapUnique(socket);
 }
 
 }  // namespace content