Use constexpr TaskTraits constructor in chrome.

chrome/browser/ui/webui/version_handler_chromeos.cc

 // Copyright (c) 2012 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/ui/webui/version_handler_chromeos.h"
 
 #include "base/bind.h"
 #include "base/task_scheduler/post_task.h"
 #include "content/public/browser/web_ui.h"
 
 VersionHandlerChromeOS::VersionHandlerChromeOS() : weak_factory_(this) {}
 
 VersionHandlerChromeOS::~VersionHandlerChromeOS() {}
 
 void VersionHandlerChromeOS::HandleRequestVersionInfo(
     const base::ListValue* args) {
   // Start the asynchronous load of the versions.
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&chromeos::version_loader::GetVersion,
                  chromeos::version_loader::VERSION_FULL),
       base::Bind(&VersionHandlerChromeOS::OnVersion,
                  weak_factory_.GetWeakPtr()));
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&chromeos::version_loader::GetFirmware),
       base::Bind(&VersionHandlerChromeOS::OnOSFirmware,
                  weak_factory_.GetWeakPtr()));
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&chromeos::version_loader::GetARCVersion),
       base::Bind(&VersionHandlerChromeOS::OnARCVersion,
                  weak_factory_.GetWeakPtr()));
 
   // Parent class takes care of the rest.
   VersionHandler::HandleRequestVersionInfo(args);
 }
 
 void VersionHandlerChromeOS::OnVersion(const std::string& version) {
   base::Value arg(version);
   web_ui()->CallJavascriptFunctionUnsafe("returnOsVersion", arg);
 }
 
 void VersionHandlerChromeOS::OnOSFirmware(const std::string& version) {
   base::Value arg(version);
   web_ui()->CallJavascriptFunctionUnsafe("returnOsFirmwareVersion", arg);
 }
 
 void VersionHandlerChromeOS::OnARCVersion(const std::string& version) {
   base::Value arg(version);
   web_ui()->CallJavascriptFunctionUnsafe("returnARCVersion", arg);
 }