Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/input_method/input_method_syncer.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/input_method/input_method_syncer.h"
 
 #include <algorithm>
 #include <set>
 #include <vector>
 
@@ skipping 224 matching lines @@
       AddSupportedInputMethodValues(enabled_extension_imes_.GetValue(),
                                     enabled_extension_imes_syncable,
                                     prefs::kLanguageEnabledExtensionImes));
 
   // Remove unsupported locales before updating the local languages preference.
   std::string languages(
       AddSupportedInputMethodValues(preferred_languages_.GetValue(),
                                     preferred_languages_syncable,
                                     prefs::kLanguagePreferredLanguages));
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&CheckAndResolveLocales, languages),
       base::Bind(&InputMethodSyncer::FinishMerge, weak_factory_.GetWeakPtr()));
 }
 
 std::string InputMethodSyncer::AddSupportedInputMethodValues(
     const std::string& pref,
     const std::string& synced_pref,
     const char* pref_name) {
   std::vector<base::StringPiece> old_tokens = base::SplitStringPiece(
       pref, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
@@ skipping 71 matching lines @@
 
 void InputMethodSyncer::OnIsSyncingChanged() {
   if (prefs_->GetBoolean(prefs::kLanguageShouldMergeInputMethods) &&
       prefs_->IsSyncing()) {
     MergeSyncedPrefs();
   }
 }
 
 }  // namespace input_method
 }  // namespace chromeos