Use constexpr TaskTraits constructor in chrome.

chrome/browser/safe_browsing/sandboxed_dmg_analyzer_mac.cc

Index: chrome/browser/safe_browsing/sandboxed_dmg_analyzer_mac.cc
diff --git a/chrome/browser/safe_browsing/sandboxed_dmg_analyzer_mac.cc b/chrome/browser/safe_browsing/sandboxed_dmg_analyzer_mac.cc
index 5668db7b795dddee285feb3be28048de2255548e..8a8449517a9dc9b5d63dcbdfb3a15517643d08ae 100644
--- a/chrome/browser/safe_browsing/sandboxed_dmg_analyzer_mac.cc
+++ b/chrome/browser/safe_browsing/sandboxed_dmg_analyzer_mac.cc
@@ -26,11 +26,8 @@ void SandboxedDMGAnalyzer::Start() {
 
   base::PostTaskWithTraits(
       FROM_HERE,
-      base::TaskTraits()
-          .MayBlock()
-          .WithPriority(base::TaskPriority::BACKGROUND)
-          .WithShutdownBehavior(
-              base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN),
+      {base::MayBlock(), base::TaskPriority::BACKGROUND,
+       base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::Bind(&SandboxedDMGAnalyzer::PrepareFileToAnalyze, this));
 }