Use constexpr TaskTraits constructor in chrome.

chrome/browser/download/download_target_determiner.cc

Index: chrome/browser/download/download_target_determiner.cc
diff --git a/chrome/browser/download/download_target_determiner.cc b/chrome/browser/download/download_target_determiner.cc
index 502b3d3e8a32c94e69510a9c9a75a49eddf113df..ecc79522d5ae3cebba42338d838bc724da240b9c 100644
--- a/chrome/browser/download/download_target_determiner.cc
+++ b/chrome/browser/download/download_target_determiner.cc
@@ -564,8 +564,7 @@ DownloadTargetDeterminer::Result
   }
 
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock(),
-      base::Bind(&::IsAdobeReaderUpToDate),
+      FROM_HERE, {base::MayBlock()}, base::Bind(&::IsAdobeReaderUpToDate),
       base::Bind(&DownloadTargetDeterminer::DetermineIfAdobeReaderUpToDateDone,
                  weak_ptr_factory_.GetWeakPtr()));
   return QUIT_DOLOOP;