Use constexpr TaskTraits constructor in chrome.

chrome/browser/ui/startup/startup_browser_creator.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 "chrome/browser/ui/startup/startup_browser_creator.h"
 
 #include <stddef.h>
 
 #include <algorithm>  // For max().
 #include <limits>
@@ skipping 666 matching lines @@
 
   if (!process_startup &&
       command_line.HasSwitch(switches::kDumpBrowserHistograms)) {
     // Only handle --dump-browser-histograms from a rendezvous. In this case, do
     // not open a new browser window even if no output file was given.
     base::FilePath output_file(
         command_line.GetSwitchValuePath(switches::kDumpBrowserHistograms));
     if (!output_file.empty()) {
       base::PostTaskWithTraits(
           FROM_HERE,
-          base::TaskTraits()
-              .MayBlock()
-              .WithPriority(base::TaskPriority::BACKGROUND)
-              .WithShutdownBehavior(base::TaskShutdownBehavior::BLOCK_SHUTDOWN),
+          {base::MayBlock(), base::TaskPriority::BACKGROUND,
+           base::TaskShutdownBehavior::BLOCK_SHUTDOWN},
           base::BindOnce(&DumpBrowserHistograms, output_file));
     }
     silent_launch = true;
   }
 
   // If --no-startup-window is specified and Chrome is already running then do
   // not open a new window.
   if (!process_startup && command_line.HasSwitch(switches::kNoStartupWindow))
     silent_launch = true;
 
@@ skipping 319 matching lines @@
     if (!entry->IsSigninRequired()) {
       Profile* profile = profile_manager->GetProfile(entry->GetPath());
       if (profile)
         return profile;
     }
   }
 
   return nullptr;
 }
 #endif  // !defined(OS_CHROMEOS) && !defined(OS_ANDROID)