Use constexpr TaskTraits constructor in chrome.

chrome/browser/extensions/api/image_writer_private/write_from_url_operation_unittest.cc

Index: chrome/browser/extensions/api/image_writer_private/write_from_url_operation_unittest.cc
diff --git a/chrome/browser/extensions/api/image_writer_private/write_from_url_operation_unittest.cc b/chrome/browser/extensions/api/image_writer_private/write_from_url_operation_unittest.cc
index cf704e6269e95d328a838f15a3060dcf6701dec5..2af538341bedab18ef381062cd335cfb0c2f9295 100644
--- a/chrome/browser/extensions/api/image_writer_private/write_from_url_operation_unittest.cc
+++ b/chrome/browser/extensions/api/image_writer_private/write_from_url_operation_unittest.cc
@@ -82,11 +82,8 @@ class ImageWriterWriteFromUrlOperationTest : public ImageWriterUnitTestBase {
     get_interceptor_.reset(new GetInterceptor(
         BrowserThread::GetTaskRunnerForThread(BrowserThread::IO),
         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})));
     get_interceptor_->SetResponse(GURL(kTestImageUrl),
                                   test_utils_.GetImagePath());
   }