Use constexpr TaskTraits constructor in chrome.

chrome/browser/search/suggestions/suggestions_service_factory.cc

Index: chrome/browser/search/suggestions/suggestions_service_factory.cc
diff --git a/chrome/browser/search/suggestions/suggestions_service_factory.cc b/chrome/browser/search/suggestions/suggestions_service_factory.cc
index cfbb3132ec8d185c29f33396e32aef809e790ba1..416cb60df84599345da583a73969bd510f76ebd7 100644
--- a/chrome/browser/search/suggestions/suggestions_service_factory.cc
+++ b/chrome/browser/search/suggestions/suggestions_service_factory.cc
@@ -64,8 +64,7 @@ KeyedService* SuggestionsServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   scoped_refptr<base::SequencedTaskRunner> background_task_runner =
       base::CreateSequencedTaskRunnerWithTraits(
-          base::TaskTraits().MayBlock().WithPriority(
-              base::TaskPriority::BACKGROUND));
+          {base::MayBlock(), base::TaskPriority::BACKGROUND});
 
   Profile* profile = static_cast<Profile*>(context);