Use constexpr TaskTraits constructor in chrome.

chrome/browser/devtools/devtools_sanity_browsertest.cc

 // Copyright (c) 2012 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 <stddef.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 182 matching lines @@
 class PushTimesMockURLRequestJob : public net::URLRequestMockHTTPJob {
  public:
   PushTimesMockURLRequestJob(net::URLRequest* request,
                              net::NetworkDelegate* network_delegate,
                              base::FilePath file_path)
       : net::URLRequestMockHTTPJob(
             request,
             network_delegate,
             file_path,
             base::CreateTaskRunnerWithTraits(
-                base::TaskTraits()
-                    .MayBlock()
-                    .WithPriority(base::TaskPriority::BACKGROUND)
-                    .WithShutdownBehavior(
-                        base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN))) {}
+                {base::MayBlock(), base::TaskPriority::BACKGROUND,
+                 base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN})) {}
 
   void Start() override {
     load_timing_info_.socket_reused = true;
     load_timing_info_.request_start_time = base::Time::Now();
     load_timing_info_.request_start = base::TimeTicks::Now();
     load_timing_info_.send_start = base::TimeTicks::Now();
     load_timing_info_.send_end = base::TimeTicks::Now();
     load_timing_info_.receive_headers_end = base::TimeTicks::Now();
 
     net::URLRequestMockHTTPJob::Start();
@@ skipping 1859 matching lines @@
   RunTestFunction(window, "testWindowInitializedOnNavigateBack");
 
   DevToolsWindowTesting::CloseDevToolsWindowSync(window);
   content::WebUIControllerFactory::UnregisterFactoryForTesting(&test_factory);
 }
 
 // Tests scripts panel showing.
 IN_PROC_BROWSER_TEST_F(DevToolsSanityTest, TestDevToolsSharedWorker) {
   RunTest("testDevToolsSharedWorker", url::kAboutBlankURL);
 }