Use TaskScheduler instead of WorkerPool in timezone_settings.cc.

chromeos/settings/timezone_settings.cc

 // Copyright 2013 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 "chromeos/settings/timezone_settings.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
 #include "base/observer_list.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/sys_info.h"
 #include "base/task_runner.h"
-#include "base/threading/worker_pool.h"
+#include "base/task_scheduler/post_task.h"
 #include "chromeos/settings/timezone_settings_helper.h"
 
 namespace chromeos {
 namespace system {
 const char kUTCTimezoneName[] = "Etc/GMT";
 }
 }
 
 namespace {
 
@@ skipping 347 matching lines @@
   // go on with |timezone|.
   const icu::TimeZone* known_timezone = GetKnownTimezoneOrNull(timezone);
   if (!known_timezone)
     known_timezone = &timezone;
 
   timezone_.reset(known_timezone->clone());
   std::string id = base::UTF16ToUTF8(GetTimezoneID(*known_timezone));
   VLOG(1) << "Setting timezone to " << id;
   // It's safe to change the timezone config files in the background as the
   // following operations don't depend on the completion of the config change.
-  base::WorkerPool::GetTaskRunner(true /* task is slow */)->
-      PostTask(FROM_HERE, base::Bind(&SetTimezoneIDFromString, id));
+  base::PostTaskWithTraits(
+      FROM_HERE, base::TaskTraits()
+                     .WithShutdownBehavior(
+                         base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
+                     .WithPriority(base::TaskPriority::BACKGROUND)
+                     .MayBlock(),
+      base::Bind(&SetTimezoneIDFromString, id));
   icu::TimeZone::setDefault(*known_timezone);
   for (auto& observer : observers_)
     observer.TimezoneChanged(*known_timezone);
 }
 
 // static
 TimezoneSettingsImpl* TimezoneSettingsImpl::GetInstance() {
   return base::Singleton<
       TimezoneSettingsImpl,
       base::DefaultSingletonTraits<TimezoneSettingsImpl>>::get();
@@ skipping 72 matching lines @@
 
 // static
 base::string16 TimezoneSettings::GetTimezoneID(const icu::TimeZone& timezone) {
   icu::UnicodeString id;
   timezone.getID(id);
   return base::string16(id.getBuffer(), id.length());
 }
 
 }  // namespace system
 }  // namespace chromeos