Use constexpr TaskTraits constructor in net.

net/socket/tcp_socket_posix.cc

 // Copyright 2013 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 "net/socket/tcp_socket.h"
 
 #include <errno.h>
 #include <netinet/tcp.h>
 #include <sys/socket.h>
 
@@ skipping 121 matching lines @@
 
 bool IsTCPFastOpenUserEnabled() {
   return g_tcp_fastopen_user_enabled;
 }
 
 // This is asynchronous because it needs to do file IO, and it isn't allowed to
 // do that on the IO thread.
 void CheckSupportAndMaybeEnableTCPFastOpen(bool user_enabled) {
 #if defined(OS_LINUX) || defined(OS_ANDROID)
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithShutdownBehavior(
-                     base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN),
+      FROM_HERE,
+      {base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::Bind(SystemSupportsTCPFastOpen),
       base::Bind(RegisterTCPFastOpenIntentAndSupport, user_enabled));
 #endif
 }
 
 TCPSocketPosix::TCPSocketPosix(
     std::unique_ptr<SocketPerformanceWatcher> socket_performance_watcher,
     NetLog* net_log,
     const NetLogSource& source)
     : socket_performance_watcher_(std::move(socket_performance_watcher)),
@@ skipping 676 matching lines @@
     if (info.tcpi_rtt > 0) {
       *out_rtt = base::TimeDelta::FromMicroseconds(info.tcpi_rtt);
       return true;
     }
   }
 #endif  // defined(TCP_INFO)
   return false;
 }
 
 }  // namespace net