Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/ownership/owner_settings_service_chromeos.cc

Index: chrome/browser/chromeos/ownership/owner_settings_service_chromeos.cc
diff --git a/chrome/browser/chromeos/ownership/owner_settings_service_chromeos.cc b/chrome/browser/chromeos/ownership/owner_settings_service_chromeos.cc
index b5bb95f47ed965609e6ca21c10e85afc6ae1fe35..b1d8e66364112e3ac16fc00ab7c3d46cca920abd 100644
--- a/chrome/browser/chromeos/ownership/owner_settings_service_chromeos.cc
+++ b/chrome/browser/chromeos/ownership/owner_settings_service_chromeos.cc
@@ -116,11 +116,8 @@ void ContinueLoadPrivateKeyOnIOThread(
 
   scoped_refptr<base::TaskRunner> task_runner =
       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});
   task_runner->PostTask(
       FROM_HERE,
       base::Bind(
@@ -167,11 +164,8 @@ void DoesPrivateKeyExistAsync(
   }
   scoped_refptr<base::TaskRunner> task_runner =
       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});
   base::PostTaskAndReplyWithResult(
       task_runner.get(),
       FROM_HERE,