Use constexpr TaskTraits constructor in chrome.

chrome/browser/renderer_host/chrome_extension_message_filter.cc

Index: chrome/browser/renderer_host/chrome_extension_message_filter.cc
diff --git a/chrome/browser/renderer_host/chrome_extension_message_filter.cc b/chrome/browser/renderer_host/chrome_extension_message_filter.cc
index 0ba1d828cb9d63bb4430ebe14969a017c2e2343b..3a9161c8555bdd96ac3026238b87c2e050991779 100644
--- a/chrome/browser/renderer_host/chrome_extension_message_filter.cc
+++ b/chrome/browser/renderer_host/chrome_extension_message_filter.cc
@@ -247,7 +247,7 @@ void ChromeExtensionMessageFilter::OnGetExtMessageBundle(
 
   // This blocks tab loading. Priority is inherited from the calling context.
   base::PostTaskWithTraits(
-      FROM_HERE, base::TaskTraits().MayBlock(),
+      FROM_HERE, {base::MayBlock()},
       base::Bind(&ChromeExtensionMessageFilter::OnGetExtMessageBundleAsync,
                  this, paths_to_load, extension_id, default_locale, reply_msg));
 }