Use constexpr TaskTraits constructor in chrome.

chrome/browser/policy/cloud/test_request_interceptor.cc

Index: chrome/browser/policy/cloud/test_request_interceptor.cc
diff --git a/chrome/browser/policy/cloud/test_request_interceptor.cc b/chrome/browser/policy/cloud/test_request_interceptor.cc
index ea725628b37acbf8c3db9f69f4b33219b08bf6bc..99bf2f1ab2aa3d146532793df7cb6e4cda66139f 100644
--- a/chrome/browser/policy/cloud/test_request_interceptor.cc
+++ b/chrome/browser/policy/cloud/test_request_interceptor.cc
@@ -65,11 +65,8 @@ net::URLRequestJob* FileJobCallback(const base::FilePath& file_path,
   return new net::URLRequestMockHTTPJob(
       request, 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}));
 }
 
 // Parses the upload data in |request| into |request_msg|, and validates the