Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/file_manager/snapshot_manager.cc

Index: chrome/browser/chromeos/file_manager/snapshot_manager.cc
diff --git a/chrome/browser/chromeos/file_manager/snapshot_manager.cc b/chrome/browser/chromeos/file_manager/snapshot_manager.cc
index e4d9eff09c0e7beb3cb6995a15a0da5ff7061725..56029e5ecc0624970ab1201ba86fc71b76704551 100644
--- a/chrome/browser/chromeos/file_manager/snapshot_manager.cc
+++ b/chrome/browser/chromeos/file_manager/snapshot_manager.cc
@@ -48,8 +48,7 @@ void ComputeSpaceNeedToBeFreedAfterGetMetadata(
   }
 
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::USER_BLOCKING),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_BLOCKING},
       base::Bind(&ComputeSpaceNeedToBeFreedAfterGetMetadataAsync, path,
                  file_info.size),
       callback);