Use constexpr TaskTraits constructor in chrome.

chrome/browser/net/load_timing_browsertest.cc

Index: chrome/browser/net/load_timing_browsertest.cc
diff --git a/chrome/browser/net/load_timing_browsertest.cc b/chrome/browser/net/load_timing_browsertest.cc
index 18af0e566aa73a797c5094f36f073d7e9d3a8da6..a892c8fc5e29b15e75373271dfc52d4896fa83ed 100644
--- a/chrome/browser/net/load_timing_browsertest.cc
+++ b/chrome/browser/net/load_timing_browsertest.cc
@@ -127,11 +127,8 @@ class MockUrlRequestJobWithTiming : public net::URLRequestFileJob {
             network_delegate,
             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})),
         load_timing_deltas_(load_timing_deltas),
         weak_factory_(this) {}