Use constexpr TaskTraits constructor in chrome.

chrome/browser/component_updater/file_type_policies_component_installer.cc

 // Copyright 2016 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/component_updater/file_type_policies_component_installer.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 68 matching lines @@
 }
 
 void FileTypePoliciesComponentInstallerTraits::ComponentReady(
     const base::Version& version,
     const base::FilePath& install_dir,
     std::unique_ptr<base::DictionaryValue> manifest) {
   VLOG(1) << "Component ready, version " << version.GetString() << " in "
           << install_dir.value();
 
   base::PostTaskWithTraits(
-      FROM_HERE,
-      base::TaskTraits().MayBlock().WithPriority(
-          base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&LoadFileTypesFromDisk, GetInstalledPath(install_dir)));
 }
 
 // Called during startup and installation before ComponentReady().
 bool FileTypePoliciesComponentInstallerTraits::VerifyInstallation(
     const base::DictionaryValue& manifest,
     const base::FilePath& install_dir) const {
   // No need to actually validate the proto here, since we'll do the checking
   // in PopulateFromDynamicUpdate().
   return base::PathExists(GetInstalledPath(install_dir));
@@ skipping 30 matching lines @@
 
   std::unique_ptr<ComponentInstallerTraits> traits(
       new FileTypePoliciesComponentInstallerTraits());
   // |cus| will take ownership of |installer| during installer->Register(cus).
   DefaultComponentInstaller* installer =
       new DefaultComponentInstaller(std::move(traits));
   installer->Register(cus, base::Closure());
 }
 
 }  // namespace component_updater