Use constexpr TaskTraits constructor in chrome.

chrome/browser/android/offline_pages/offline_page_model_factory.cc

Index: chrome/browser/android/offline_pages/offline_page_model_factory.cc
diff --git a/chrome/browser/android/offline_pages/offline_page_model_factory.cc b/chrome/browser/android/offline_pages/offline_page_model_factory.cc
index 75f965b9652df2246aac7a7d341ca6f36709ca6a..29ae3e540fdb3342c9e02b0060b930e7436d950a 100644
--- a/chrome/browser/android/offline_pages/offline_page_model_factory.cc
+++ b/chrome/browser/android/offline_pages/offline_page_model_factory.cc
@@ -41,7 +41,7 @@ KeyedService* OfflinePageModelFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   Profile* profile = Profile::FromBrowserContext(context);
   scoped_refptr<base::SequencedTaskRunner> background_task_runner =
-      base::CreateSequencedTaskRunnerWithTraits(base::TaskTraits().MayBlock());
+      base::CreateSequencedTaskRunnerWithTraits({base::MayBlock()});
 
   base::FilePath store_path =
       profile->GetPath().Append(chrome::kOfflinePageMetadataDirname);