Use constexpr TaskTraits constructor in chrome.

chrome/browser/extensions/api/easy_unlock_private/easy_unlock_private_api.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/extensions/api/easy_unlock_private/easy_unlock_private_api.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/base64url.h"
@@ skipping 473 matching lines @@
 
   proximity_auth::bluetooth_util::SeekDeviceByAddress(
       params->device_address,
       base::Bind(
           &EasyUnlockPrivateSeekBluetoothDeviceByAddressFunction::OnSeekSuccess,
           this),
       base::Bind(
           &EasyUnlockPrivateSeekBluetoothDeviceByAddressFunction::OnSeekFailure,
           this),
       base::CreateTaskRunnerWithTraits(
-          base::TaskTraits()
-              .MayBlock()
-              .WithPriority(base::TaskPriority::BACKGROUND)
-              .WithShutdownBehavior(
-                  base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN))
+          {base::MayBlock(), base::TaskPriority::BACKGROUND,
+           base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN})
           .get());
   return true;
 }
 
 void EasyUnlockPrivateSeekBluetoothDeviceByAddressFunction::OnSeekSuccess() {
   SendResponse(true);
 }
 
 void EasyUnlockPrivateSeekBluetoothDeviceByAddressFunction::OnSeekFailure(
     const std::string& error_message) {
@@ skipping 668 matching lines @@
       GetConnectionManager(browser_context())
           ->GetDeviceAddress(extension(), params->connection_id);
   if (device_address.empty())
     return RespondNow(Error("Invalid connectionId."));
   return RespondNow(ArgumentList(
       easy_unlock_private::SetupConnectionGetDeviceAddress::Results::Create(
           device_address)));
 }
 
 }  // namespace extensions