Use constexpr TaskTraits constructor in chrome.

chrome/browser/supervised_user/supervised_user_site_list.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_site_list.h"
 
 #include <algorithm>
 
 #include "base/files/file_util.h"
 #include "base/json/json_file_value_serializer.h"
@@ skipping 73 matching lines @@
   return *reinterpret_cast<const size_t*>(bytes_.data());
 }
 
 void SupervisedUserSiteList::Load(const std::string& id,
                                   const base::string16& title,
                                   const base::FilePath& large_icon_path,
                                   const base::FilePath& path,
                                   const LoadedCallback& callback) {
   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(&ReadFileOnBlockingThread, path),
       base::BindOnce(&SupervisedUserSiteList::OnJsonLoaded, id, title,
                      large_icon_path, path, base::TimeTicks::Now(), callback));
 }
 
 SupervisedUserSiteList::SupervisedUserSiteList(
     const std::string& id,
     const base::string16& title,
     const GURL& entry_point,
     const base::FilePath& large_icon_path,
@@ skipping 82 matching lines @@
   base::ListValue* patterns = nullptr;
   dict->GetList(kWhitelistKey, &patterns);
 
   base::ListValue* hostname_hashes = nullptr;
   dict->GetList(kHostnameHashesKey, &hostname_hashes);
 
   callback.Run(make_scoped_refptr(
       new SupervisedUserSiteList(id, title, GURL(entry_point_url),
                                  large_icon_path, patterns, hostname_hashes)));
 }