Use constexpr TaskTraits constructor in chrome.

chrome/browser/browsing_data/site_data_size_collector.cc

Index: chrome/browser/browsing_data/site_data_size_collector.cc
diff --git a/chrome/browser/browsing_data/site_data_size_collector.cc b/chrome/browser/browsing_data/site_data_size_collector.cc
index 98873ac016afee6a0902173dfa3fd6c844302fe3..fd424e7474fa09dcd4cdba919183976f2a01f987 100644
--- a/chrome/browser/browsing_data/site_data_size_collector.cc
+++ b/chrome/browser/browsing_data/site_data_size_collector.cc
@@ -147,8 +147,7 @@ void SiteDataSizeCollector::OnCookiesModelInfoLoaded(
   base::FilePath cookie_file_path = default_storage_partition_path_
       .Append(chrome::kCookieFilename);
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&GetFileSizeBlocking, cookie_file_path),
       base::Bind(&SiteDataSizeCollector::OnStorageSizeFetched,
                  weak_ptr_factory_.GetWeakPtr()));
@@ -203,8 +202,7 @@ void SiteDataSizeCollector::OnChannelIDModelInfoLoaded(
   base::FilePath channel_id_file_path = default_storage_partition_path_
       .Append(chrome::kChannelIDFilename);
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&GetFileSizeBlocking, channel_id_file_path),
       base::Bind(&SiteDataSizeCollector::OnStorageSizeFetched,
                  weak_ptr_factory_.GetWeakPtr()));
@@ -241,8 +239,7 @@ void SiteDataSizeCollector::OnFlashLSOInfoLoaded(
   base::FilePath pepper_data_dir_path = default_storage_partition_path_
       .Append(content::kPepperDataDirname);
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&base::ComputeDirectorySize, pepper_data_dir_path),
       base::Bind(&SiteDataSizeCollector::OnStorageSizeFetched,
                  weak_ptr_factory_.GetWeakPtr()));