Use constexpr TaskTraits constructor in chrome.

chrome/browser/supervised_user/legacy/supervised_user_registration_utility.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/legacy/supervised_user_registration_utility.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/base64.h"
@@ skipping 285 matching lines @@
         supervised_user_shared_settings_service_, pending_supervised_user_id_,
         supervised_users::kChromeOSPasswordData,
         std::unique_ptr<base::Value>(info.password_data.DeepCopy()),
         base::Bind(&SupervisedUserRegistrationUtilityImpl::
                        OnPasswordChangeAcknowledged,
                    weak_ptr_factory_.GetWeakPtr())));
   }
 
   syncer::GetSessionName(
       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(),
       base::Bind(&SupervisedUserRegistrationUtilityImpl::FetchToken,
                  weak_ptr_factory_.GetWeakPtr()));
 }
 
 void SupervisedUserRegistrationUtilityImpl::CancelPendingRegistration() {
   AbortPendingRegistration(
       false,  // Don't run the callback. The error will be ignored.
       GoogleServiceAuthError(GoogleServiceAuthError::NONE));
 }
@@ skipping 89 matching lines @@
           pending_supervised_user_id_);
     }
   }
 
   if (run_callback)
     callback_.Run(error, pending_supervised_user_token_);
   callback_.Reset();
 }
 
 } // namespace