Use constexpr TaskTraits constructor in chrome.

chrome/browser/supervised_user/supervised_user_service.cc

 // Copyright 2014 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 "chrome/browser/supervised_user/supervised_user_service.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
@@ skipping 737 matching lines @@
   whitelists_ = site_lists;
   url_filter_.LoadWhitelists(site_lists);
 }
 
 void SupervisedUserService::LoadBlacklist(const base::FilePath& path,
                                           const GURL& url) {
   DCHECK(blacklist_state_ == BlacklistLoadState::NOT_LOADED);
   blacklist_state_ = BlacklistLoadState::LOAD_STARTED;
   base::PostTaskWithTraitsAndReplyWithResult(
       FROM_HERE,
-      base::TaskTraits()
-          .MayBlock()
-          .WithPriority(base::TaskPriority::BACKGROUND)
-          .WithShutdownBehavior(
-              base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN),
+      {base::MayBlock(), base::TaskPriority::BACKGROUND,
+       base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::BindOnce(&base::PathExists, path),
       base::BindOnce(&SupervisedUserService::OnBlacklistFileChecked,
                      weak_ptr_factory_.GetWeakPtr(), path, url));
 }
 
 void SupervisedUserService::OnBlacklistFileChecked(const base::FilePath& path,
                                                    const GURL& url,
                                                    bool file_exists) {
   DCHECK(blacklist_state_ == BlacklistLoadState::LOAD_STARTED);
   if (file_exists) {
@@ skipping 437 matching lines @@
     base::RecordAction(UserMetricsAction("ManagedUsers_SwitchProfile"));
 
   is_profile_active_ = profile_became_active;
 }
 #endif  // !defined(OS_ANDROID)
 
 void SupervisedUserService::OnSiteListUpdated() {
   for (SupervisedUserServiceObserver& observer : observer_list_)
     observer.OnURLFilterChanged();
 }