Use constexpr TaskTraits constructor everywhere.

chrome/browser/supervised_user/supervised_user_url_filter.cc

Index: chrome/browser/supervised_user/supervised_user_url_filter.cc
diff --git a/chrome/browser/supervised_user/supervised_user_url_filter.cc b/chrome/browser/supervised_user/supervised_user_url_filter.cc
index 81cb848ff83bf64761a80213164b4629f8aa9344..43767fc2a19b4fe478c5d4d96f5fb88710c31a9e 100644
--- a/chrome/browser/supervised_user/supervised_user_url_filter.cc
+++ b/chrome/browser/supervised_user/supervised_user_url_filter.cc
@@ -236,14 +236,9 @@ SupervisedUserURLFilter::SupervisedUserURLFilter()
       amp_cache_path_regex_(kAmpCachePathPattern),
       google_amp_viewer_path_regex_(kGoogleAmpViewerPathPattern),
       google_web_cache_query_regex_(kGoogleWebCacheQueryPattern),
-      blocking_task_runner_(
-          base::CreateTaskRunnerWithTraits(
-              base::TaskTraits()
-                  .MayBlock()
-                  .WithPriority(base::TaskPriority::BACKGROUND)
-                  .WithShutdownBehavior(
-                      base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN))
-              .get()),
+      blocking_task_runner_(base::CreateTaskRunnerWithTraits(
+          {base::MayBlock(), base::TaskPriority::BACKGROUND,
+           base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN})),
       weak_ptr_factory_(this) {
   DCHECK(amp_cache_path_regex_.ok());
   DCHECK(google_amp_viewer_path_regex_.ok());