Use constexpr TaskTraits constructor in chrome.

chrome/browser/metrics/chrome_metrics_services_manager_client.cc

 // Copyright 2015 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/metrics/chrome_metrics_services_manager_client.h"
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 46 matching lines @@
 // Metrics reporting feature. This feature, along with user consent, controls if
 // recording and reporting are enabled. If the feature is enabled, but no
 // consent is given, then there will be no recording or reporting.
 const base::Feature kMetricsReportingFeature{"MetricsReporting",
                                              base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Posts |GoogleUpdateSettings::StoreMetricsClientInfo| on blocking pool thread
 // because it needs access to IO and cannot work from UI thread.
 void PostStoreMetricsClientInfo(const metrics::ClientInfo& client_info) {
   base::PostTaskWithTraits(
-      FROM_HERE,
-      base::TaskTraits()
-          .WithPriority(base::TaskPriority::BACKGROUND)
-          .MayBlock(),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::BindOnce(&GoogleUpdateSettings::StoreMetricsClientInfo,
                      client_info));
 }
 
 // Appends a group to the sampling controlling |trial|. The group will be
 // associated with a variation param for reporting sampling |rate| in per mille.
 void AppendSamplingTrialGroup(const std::string& group_name,
                               int rate,
                               base::FieldTrial* trial) {
   std::map<std::string, std::string> params = {
@@ skipping 203 matching lines @@
 ChromeMetricsServicesManagerClient::GetMetricsStateManager() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (!metrics_state_manager_) {
     metrics_state_manager_ = metrics::MetricsStateManager::Create(
         local_state_, enabled_state_provider_.get(),
         base::Bind(&PostStoreMetricsClientInfo),
         base::Bind(&GoogleUpdateSettings::LoadMetricsClientInfo));
   }
   return metrics_state_manager_.get();
 }