Use constexpr TaskTraits constructor in ui.

ui/arc/notification/arc_notification_item.cc

 // Copyright 2016 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 "ui/arc/notification/arc_notification_item.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
@@ skipping 218 matching lines @@
       notifier_id, rich_data,
       new ArcNotificationDelegate(weak_ptr_factory_.GetWeakPtr())));
 
   if (data->icon_data.size() == 0) {
     OnImageDecoded(SkBitmap());  // Pass an empty bitmap.
     return;
   }
 
   // TODO(yoshiki): Remove decoding by passing a bitmap directly from Android.
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().WithShutdownBehavior(
-                     base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN),
+      FROM_HERE, {base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::Bind(&DecodeImage, data->icon_data),
       base::Bind(&ArcNotificationItem::OnImageDecoded,
                  weak_ptr_factory_.GetWeakPtr()));
 }
 
 ArcNotificationItem::~ArcNotificationItem() {}
 
 void ArcNotificationItem::OnClosedFromAndroid() {
   being_removed_by_manager_ = true;  // Closing is initiated by the manager.
   message_center_->RemoveNotification(notification_id_, false /* by_user */);
@@ skipping 90 matching lines @@
 
 void ArcNotificationItem::OnImageDecoded(const SkBitmap& bitmap) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   gfx::Image image = gfx::Image::CreateFrom1xBitmap(bitmap);
   notification_->set_icon(image);
   AddToMessageCenter();
 }
 
 }  // namespace arc