Use constexpr TaskTraits constructor in chrome.

chrome/browser/ntp_snippets/content_suggestions_service_factory.cc

Index: chrome/browser/ntp_snippets/content_suggestions_service_factory.cc
diff --git a/chrome/browser/ntp_snippets/content_suggestions_service_factory.cc b/chrome/browser/ntp_snippets/content_suggestions_service_factory.cc
index 3ef2bf58837a87be4c94e24d6458c1e79df0ae83..d5c9e87ac0a90c197d735b6145d1d9528dff2a62 100644
--- a/chrome/browser/ntp_snippets/content_suggestions_service_factory.cc
+++ b/chrome/browser/ntp_snippets/content_suggestions_service_factory.cc
@@ -205,11 +205,8 @@ void RegisterArticleProvider(SigninManagerBase* signin_manager,
       profile->GetPath().Append(ntp_snippets::kDatabaseFolder));
   scoped_refptr<base::SequencedTaskRunner> task_runner =
       base::CreateSequencedTaskRunnerWithTraits(
-          base::TaskTraits()
-              .MayBlock()
-              .WithPriority(base::TaskPriority::BACKGROUND)
-              .WithShutdownBehavior(
-                  base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN));
+          {base::MayBlock(), base::TaskPriority::BACKGROUND,
+           base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN});
   std::string api_key;
   // The API is private. If we don't have the official API key, don't even try.
   if (google_apis::IsGoogleChromeAPIKeyUsed()) {