Use constexpr TaskTraits constructor in chrome.

chrome/browser/net/dns_probe_browsertest.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 <memory>
 #include <set>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
@@ skipping 168 matching lines @@
       net::URLRequest* request,
       net::NetworkDelegate* network_delegate,
       const base::FilePath& file_path,
       bool should_delay,
       const DestructionCallback& destruction_callback)
       : 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})),
         should_delay_(should_delay),
         start_delayed_(false),
         destruction_callback_(destruction_callback) {}
 
   void Start() override {
     if (should_delay_) {
       DCHECK(!start_delayed_);
       start_delayed_ = true;
       return;
     }
@@ skipping 781 matching lines @@
 
   EXPECT_EQ(error_page::DNS_PROBE_FINISHED_INCONCLUSIVE,
             WaitForSentStatus());
   EXPECT_EQ(0, pending_status_count());
   ExpectDisplayingLocalErrorPage("ERR_NAME_NOT_RESOLVED");
 }
 
 }  // namespace
 
 }  // namespace chrome_browser_net