Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/power/cpu_data_collector.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/power/cpu_data_collector.h"
 
 #include <stddef.h>
 
 #include <vector>
 
@@ skipping 361 matching lines @@
   std::vector<std::string>* cpu_idle_state_names =
       new std::vector<std::string>(cpu_idle_state_names_);
   std::vector<StateOccupancySample>* idle_samples =
       new std::vector<StateOccupancySample>;
   std::vector<std::string>* cpu_freq_state_names =
       new std::vector<std::string>(cpu_freq_state_names_);
   std::vector<StateOccupancySample>* freq_samples =
       new std::vector<StateOccupancySample>;
 
   base::PostTaskWithTraitsAndReply(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&SampleCpuStateAsync, base::Unretained(cpu_count),
                  base::Unretained(cpu_idle_state_names),
                  base::Unretained(idle_samples),
                  base::Unretained(cpu_freq_state_names),
                  base::Unretained(freq_samples)),
       base::Bind(&CpuDataCollector::SaveCpuStateSamplesOnUIThread,
                  weak_ptr_factory_.GetWeakPtr(), base::Owned(cpu_count),
                  base::Owned(cpu_idle_state_names), base::Owned(idle_samples),
                  base::Owned(cpu_freq_state_names), base::Owned(freq_samples)));
 }
@@ skipping 46 matching lines @@
     : cpu_online(false) {
 }
 
 CpuDataCollector::StateOccupancySample::StateOccupancySample(
     const StateOccupancySample& other) = default;
 
 CpuDataCollector::StateOccupancySample::~StateOccupancySample() {
 }
 
 }  // namespace chromeos