Remove deprecated NonThreadSafe usage in net\socket.

net/socket/udp_socket_posix.h

 // 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.
 
 #ifndef NET_SOCKET_UDP_SOCKET_POSIX_H_
 #define NET_SOCKET_UDP_SOCKET_POSIX_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/threading/thread_checker.h"
 #include "net/base/address_family.h"
 #include "net/base/completion_callback.h"
 #include "net/base/io_buffer.h"
 #include "net/base/ip_endpoint.h"
 #include "net/base/net_export.h"
 #include "net/base/network_change_notifier.h"
 #include "net/base/rand_callback.h"
 #include "net/log/net_log_with_source.h"
 #include "net/socket/datagram_socket.h"
 #include "net/socket/diff_serv_code_point.h"
 #include "net/socket/socket_descriptor.h"
 
 namespace net {
 
 class IPAddress;
 class NetLog;
 struct NetLogSource;
 
-class NET_EXPORT UDPSocketPosix : public base::NonThreadSafe {
+class NET_EXPORT UDPSocketPosix {
  public:
   UDPSocketPosix(DatagramSocket::BindType bind_type,
                  const RandIntCallback& rand_int_cb,
                  net::NetLog* net_log,
                  const net::NetLogSource& source);
   virtual ~UDPSocketPosix();
 
   // Opens the socket.
   // Returns a net error code.
   int Open(AddressFamily address_family);
@@ skipping 269 matching lines @@
   CompletionCallback read_callback_;
 
   // External callback; called when write is complete.
   CompletionCallback write_callback_;
 
   NetLogWithSource net_log_;
 
   // Network that this socket is bound to via BindToNetwork().
   NetworkChangeNotifier::NetworkHandle bound_network_;
 
+  THREAD_CHECKER(thread_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(UDPSocketPosix);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_UDP_SOCKET_POSIX_H_