Use constexpr TaskTraits constructor in content.

content/browser/blob_storage/chrome_blob_storage_context.cc

Index: content/browser/blob_storage/chrome_blob_storage_context.cc
diff --git a/content/browser/blob_storage/chrome_blob_storage_context.cc b/content/browser/blob_storage/chrome_blob_storage_context.cc
index 0d0369a7f345e5561a6f6c1532ff39a5e3c5b793..92a2e8941c0fcca57d09b8133c65809a37972168 100644
--- a/content/browser/blob_storage/chrome_blob_storage_context.cc
+++ b/content/browser/blob_storage/chrome_blob_storage_context.cc
@@ -103,11 +103,8 @@ ChromeBlobStorageContext* ChromeBlobStorageContext::GetFor(
     // disk on the storage context.
     if (!context->IsOffTheRecord() && io_thread_valid) {
       file_task_runner = 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});
       // Removes our old blob directories if they exist.
       BrowserThread::PostAfterStartupTask(
           FROM_HERE, file_task_runner,