Always use NonBlocking IO for UDP sockets on Windows.

content/browser/renderer_host/p2p/socket_host_udp_unittest.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 <stdint.h>
 #include <deque>
 #include <utility>
 #include <vector>
@@ skipping 54 matching lines @@
   int GetPeerAddress(net::IPEndPoint* address) const override {
     NOTREACHED();
     return net::ERR_SOCKET_NOT_CONNECTED;
   }
 
   int GetLocalAddress(net::IPEndPoint* address) const override {
     *address = address_;
     return 0;
   }
 
-  void UseNonBlockingIO() override {}
-
   int Listen(const net::IPEndPoint& address) override {
     if (used_ports_) {
       for (auto used_port : *used_ports_) {
         if (used_port == address.port())
           return -1;
       }
       used_ports_->push_back(address.port());
     }
 
     address_ = address;
@@ skipping 480 matching lines @@
   std::unique_ptr<P2PSocketHostUdp> socket_host(
       new P2PSocketHostUdp(&sender, 0, &throttler, fake_socket_factory));
   net::IPEndPoint local_address =
       ParseAddress(kTestLocalIpAddress, invalid_port);
   bool rv = socket_host->Init(local_address, min_port, max_port,
                               P2PHostAndIPEndPoint());
   EXPECT_FALSE(rv);
 }
 
 }  // namespace content