Use constexpr TaskTraits constructor in chrome.

chrome/browser/pepper_flash_settings_manager.cc

Index: chrome/browser/pepper_flash_settings_manager.cc
diff --git a/chrome/browser/pepper_flash_settings_manager.cc b/chrome/browser/pepper_flash_settings_manager.cc
index 67f63468962d4417bef417e0fc999d943adf99b7..6babc64defb0489bfb759190065031685a124f18 100644
--- a/chrome/browser/pepper_flash_settings_manager.cc
+++ b/chrome/browser/pepper_flash_settings_manager.cc
@@ -441,8 +441,7 @@ void PepperFlashSettingsManager::Core::DeauthorizeContentLicensesOnIOThread(
 
 #if defined(OS_CHROMEOS)
   base::PostTaskWithTraits(FROM_HERE,
-                           base::TaskTraits().MayBlock().WithPriority(
-                               base::TaskPriority::BACKGROUND),
+                           {base::MayBlock(), base::TaskPriority::BACKGROUND},
                            base::Bind(&Core::DeauthorizeContentLicensesAsync,
                                       this, request_id, browser_context_path_));
 #else