Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/login/users/supervised_user_manager_impl.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/chromeos/login/users/supervised_user_manager_impl.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_util.h"
@@ skipping 499 matching lines @@
 }
 
 void SupervisedUserManagerImpl::LoadSupervisedUserToken(
     Profile* profile,
     const LoadTokenCallback& callback) {
   // TODO(antrim): use profile->GetPath() once we sure it is safe.
   base::FilePath profile_dir = ProfileHelper::GetProfilePathByUserIdHash(
       ProfileHelper::Get()->GetUserByProfile(profile)->username_hash());
   PostTaskAndReplyWithResult(
       base::CreateTaskRunnerWithTraits(
-          base::TaskTraits()
-              .MayBlock()
-              .WithPriority(base::TaskPriority::BACKGROUND)
-              .WithShutdownBehavior(
-                  base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN))
+          {base::MayBlock(), base::TaskPriority::BACKGROUND,
+           base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN})
           .get(),
       FROM_HERE, base::Bind(&LoadSyncToken, profile_dir), callback);
 }
 
 void SupervisedUserManagerImpl::ConfigureSyncWithToken(
     Profile* profile,
     const std::string& token) {
   if (!token.empty())
     SupervisedUserServiceFactory::GetForProfile(profile)->InitSync(token);
 }
 
 }  // namespace chromeos