Use constexpr TaskTraits constructor in chrome.

chrome/browser/net/dns_probe_browsertest.cc

Index: chrome/browser/net/dns_probe_browsertest.cc
diff --git a/chrome/browser/net/dns_probe_browsertest.cc b/chrome/browser/net/dns_probe_browsertest.cc
index 6235a9c0d8f1fb207fbb5080b5befdd42808202c..dfbdd3f040659063772c715972084f7d2386e268 100644
--- a/chrome/browser/net/dns_probe_browsertest.cc
+++ b/chrome/browser/net/dns_probe_browsertest.cc
@@ -186,11 +186,8 @@ class DelayableURLRequestMockHTTPJob : public URLRequestMockHTTPJob,
             network_delegate,
             file_path,
             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})),
         should_delay_(should_delay),
         start_delayed_(false),
         destruction_callback_(destruction_callback) {}