Use constexpr TaskTraits constructor in chrome.

chrome/browser/google/google_brand_chromeos.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 "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/task_scheduler/post_task.h"
@@ skipping 57 matching lines @@
       ::chromeos::system::StatisticsProvider::GetInstance();
   std::string brand;
   const bool found = provider->GetMachineStatistic(
       ::chromeos::system::kRlzBrandCodeKey, &brand);
   if (found && !brand.empty()) {
     SetBrand(callback, brand);
     return;
   }
 
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits()
-                     .WithShutdownBehavior(
-                         base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-                     .WithPriority(base::TaskPriority::BACKGROUND)
-                     .MayBlock(),
+      FROM_HERE,
+      {base::MayBlock(), base::TaskPriority::BACKGROUND,
+       base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::Bind(&ReadBrandFromFile), base::Bind(&SetBrand, callback));
 }
 
 }  // namespace chromeos
 }  // namespace google_brand