Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/extensions/install_limiter.cc

Index: chrome/browser/chromeos/extensions/install_limiter.cc
diff --git a/chrome/browser/chromeos/extensions/install_limiter.cc b/chrome/browser/chromeos/extensions/install_limiter.cc
index 5153754293001a1510661eb2f5ef88b335163189..d2984d68d6e4492ff53f7288fd9ff1e64bd7414e 100644
--- a/chrome/browser/chromeos/extensions/install_limiter.cc
+++ b/chrome/browser/chromeos/extensions/install_limiter.cc
@@ -69,7 +69,7 @@ void InstallLimiter::Add(const scoped_refptr<CrxInstaller>& installer,
   }
 
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock(), base::Bind(&GetFileSize, path),
+      FROM_HERE, {base::MayBlock()}, base::Bind(&GetFileSize, path),
       base::Bind(&InstallLimiter::AddWithSize, AsWeakPtr(), installer, path));
 }