Use constexpr TaskTraits constructor in ui.

ui/events/ozone/device/device_manager_manual.cc

Index: ui/events/ozone/device/device_manager_manual.cc
diff --git a/ui/events/ozone/device/device_manager_manual.cc b/ui/events/ozone/device/device_manager_manual.cc
index 9d13a107ad4168d60c37f9fa54d77e3d5b42ccff..c4a709923d56396249d2d0e9a55bfd3fadce8c21 100644
--- a/ui/events/ozone/device/device_manager_manual.cc
+++ b/ui/events/ozone/device/device_manager_manual.cc
@@ -64,10 +64,7 @@ void DeviceManagerManual::InitiateScanDevices() {
   std::vector<base::FilePath>* result = new std::vector<base::FilePath>();
   base::PostTaskWithTraitsAndReply(
       FROM_HERE,
-      base::TaskTraits()
-          .WithShutdownBehavior(
-              base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-          .MayBlock(),
+      {base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::Bind(&ScanDevicesOnWorkerThread, result),
       base::Bind(&DeviceManagerManual::OnDevicesScanned,
                  weak_ptr_factory_.GetWeakPtr(), base::Owned(result)));