Use constexpr TaskTraits constructor in device.

device/bluetooth/dbus/fake_bluetooth_device_client.cc

Index: device/bluetooth/dbus/fake_bluetooth_device_client.cc
diff --git a/device/bluetooth/dbus/fake_bluetooth_device_client.cc b/device/bluetooth/dbus/fake_bluetooth_device_client.cc
index 3ce62c3519c1d4cab6d4587e31703d0dbed40105..4dd09ffe817d3b6261d3a4e266f3e81229f97d0c 100644
--- a/device/bluetooth/dbus/fake_bluetooth_device_client.cc
+++ b/device/bluetooth/dbus/fake_bluetooth_device_client.cc
@@ -519,10 +519,8 @@ void FakeBluetoothDeviceClient::ConnectProfile(
   }
 
   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]);