Use constexpr TaskTraits constructor in chromeos.

chromeos/dbus/fake_auth_policy_client.cc

 // Copyright 2016 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/dbus/fake_auth_policy_client.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
@@ skipping 135 matching lines @@
   }
   policy_path = policy_path.DirName().AppendASCII("stub_device_policy");
 
   em::ChromeDeviceSettingsProto policy;
   std::string payload;
   CHECK(policy.SerializeToString(&payload));
 
   // Drop file for SessionManagerClientStubImpl to read.
   base::PostTaskWithTraitsAndReplyWithResult(
       FROM_HERE,
-      base::TaskTraits()
-          .WithShutdownBehavior(
-              base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-          .WithPriority(base::TaskPriority::BACKGROUND)
-          .MayBlock(),
+      {base::MayBlock(), base::TaskPriority::BACKGROUND,
+       base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::BindOnce(&WritePolicyFile, policy_path, payload,
                      "google/chromeos/device"),
       std::move(callback));
 }
 
 void FakeAuthPolicyClient::RefreshUserPolicy(const AccountId& account_id,
                                              RefreshPolicyCallback callback) {
   if (!started_) {
     LOG(ERROR) << "authpolicyd not started";
     std::move(callback).Run(false);
@@ skipping 11 matching lines @@
   policy_path = policy_path.AppendASCII(sanitized_username);
   policy_path = policy_path.AppendASCII("stub_policy");
 
   em::CloudPolicySettings policy;
   std::string payload;
   CHECK(policy.SerializeToString(&payload));
 
   // Drop file for SessionManagerClientStubImpl to read.
   base::PostTaskWithTraitsAndReplyWithResult(
       FROM_HERE,
-      base::TaskTraits()
-          .WithShutdownBehavior(
-              base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-          .WithPriority(base::TaskPriority::BACKGROUND)
-          .MayBlock(),
+      {base::MayBlock(), base::TaskPriority::BACKGROUND,
+       base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::BindOnce(&WritePolicyFile, policy_path, payload,
                      "google/chromeos/user"),
       std::move(callback));
 }
 
 }  // namespace chromeos