Use constexpr TaskTraits constructor in chrome.

chrome/browser/loader/chrome_resource_dispatcher_host_delegate_browsertest.cc

Index: chrome/browser/loader/chrome_resource_dispatcher_host_delegate_browsertest.cc
diff --git a/chrome/browser/loader/chrome_resource_dispatcher_host_delegate_browsertest.cc b/chrome/browser/loader/chrome_resource_dispatcher_host_delegate_browsertest.cc
index c70b9d53758061a91393b3424d5006869ff7eb45..1f3da25c00f430bc07d5b2315da752c66c115fd5 100644
--- a/chrome/browser/loader/chrome_resource_dispatcher_host_delegate_browsertest.cc
+++ b/chrome/browser/loader/chrome_resource_dispatcher_host_delegate_browsertest.cc
@@ -391,11 +391,8 @@ class MirrorMockJobInterceptor : public net::URLRequestInterceptor {
     return new MirrorMockURLRequestJob(
         request, network_delegate, root_http_,
         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}),
         report_on_ui_);
   }