Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/policy/user_policy_manager_factory_chromeos.cc

Index: chrome/browser/chromeos/policy/user_policy_manager_factory_chromeos.cc
diff --git a/chrome/browser/chromeos/policy/user_policy_manager_factory_chromeos.cc b/chrome/browser/chromeos/policy/user_policy_manager_factory_chromeos.cc
index de20145379dcdb9d0ed1e87415299da508a79bed..171a22ae88498e593159fe8bdff49f59bdd6bc83 100644
--- a/chrome/browser/chromeos/policy/user_policy_manager_factory_chromeos.cc
+++ b/chrome/browser/chromeos/policy/user_policy_manager_factory_chromeos.cc
@@ -241,11 +241,8 @@ UserPolicyManagerFactoryChromeOS::CreateManagerForProfile(
 
   scoped_refptr<base::SequencedTaskRunner> backend_task_runner =
       base::CreateSequencedTaskRunnerWithTraits(
-          base::TaskTraits()
-              .MayBlock()
-              .WithPriority(base::TaskPriority::BACKGROUND)
-              .WithShutdownBehavior(
-                  base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN));
+          {base::MayBlock(), base::TaskPriority::BACKGROUND,
+           base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN});
   scoped_refptr<base::SequencedTaskRunner> io_task_runner =
       content::BrowserThread::GetTaskRunnerForThread(
           content::BrowserThread::IO);