Use constexpr TaskTraits constructor in chrome.

chrome/browser/android/webapk/webapk_installer.cc

Index: chrome/browser/android/webapk/webapk_installer.cc
diff --git a/chrome/browser/android/webapk/webapk_installer.cc b/chrome/browser/android/webapk/webapk_installer.cc
index 5f913577502314f1e6767c272b081e04d139dd32..1ac3740a961630d650f29fc197d26ae9f7395ef2 100644
--- a/chrome/browser/android/webapk/webapk_installer.cc
+++ b/chrome/browser/android/webapk/webapk_installer.cc
@@ -180,10 +180,8 @@ void OnWebApkProtoBuilt(
 // Returns task runner for running background tasks.
 scoped_refptr<base::TaskRunner> GetBackgroundTaskRunner() {
   return 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});
 }
 
 }  // anonymous namespace