Use constexpr TaskTraits constructor in device.

device/bluetooth/dbus/fake_bluetooth_device_client.cc

 // Copyright (c) 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 "device/bluetooth/dbus/fake_bluetooth_device_client.h"
 
 #include <fcntl.h>
 #include <stddef.h>
 #include <sys/socket.h>
 #include <sys/types.h>
@@ skipping 501 matching lines @@
     return;
   }
 
   args |= O_NONBLOCK;
   if (fcntl(fds[1], F_SETFL, args) < 0) {
     error_callback.Run(kNoResponseError, "failed to set socket non-blocking");
     return;
   }
 
   base::PostTaskWithTraits(
-      FROM_HERE, base::TaskTraits()
-                     .WithShutdownBehavior(
-                         base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-                     .MayBlock(),
+      FROM_HERE,
+      {base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::Bind(&SimulatedProfileSocket, fds[0]));
 
   base::ScopedFD fd(fds[1]);
 
   // Post the new connection to the service provider.
   BluetoothProfileServiceProvider::Delegate::Options options;
 
   profile_service_provider->NewConnection(
       object_path, std::move(fd), options,
       base::Bind(&FakeBluetoothDeviceClient::ConnectionCallback,
@@ skipping 1311 matching lines @@
     properties->service_data.set_valid(true);
   }
 
   properties_map_.insert(std::make_pair(device_path, std::move(properties)));
   device_list_.push_back(device_path);
   for (auto& observer : observers_)
     observer.DeviceAdded(device_path);
 }
 
 }  // namespace bluez