Use constexpr TaskTraits constructor in chrome.

chrome/browser/component_updater/widevine_cdm_component_installer.cc

 // Copyright (c) 2013 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/widevine_cdm_component_installer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <string.h>
 #include <memory>
@@ skipping 294 matching lines @@
 void WidevineCdmComponentInstallerTraits::ComponentReady(
     const base::Version& version,
     const base::FilePath& path,
     std::unique_ptr<base::DictionaryValue> manifest) {
   if (!IsCompatibleWithChrome(*manifest)) {
     VLOG(1) << "Installed Widevine CDM component is incompatible.";
     return;
   }
 
   base::PostTaskWithTraits(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&WidevineCdmComponentInstallerTraits::UpdateCdmAdapter,
                  base::Unretained(this), version, path,
                  base::Passed(&manifest)));
 }
 
 bool WidevineCdmComponentInstallerTraits::VerifyInstallation(
     const base::DictionaryValue& manifest,
     const base::FilePath& install_dir) const {
   return IsCompatibleWithChrome(manifest) &&
          base::PathExists(GetPlatformDirectory(install_dir)
@@ skipping 119 matching lines @@
   std::unique_ptr<ComponentInstallerTraits> traits(
       new WidevineCdmComponentInstallerTraits);
   // |cus| will take ownership of |installer| during installer->Register(cus).
   DefaultComponentInstaller* installer =
       new DefaultComponentInstaller(std::move(traits));
   installer->Register(cus, base::Closure());
 #endif  // defined(WIDEVINE_CDM_AVAILABLE) && defined(WIDEVINE_CDM_IS_COMPONENT)
 }
 
 }  // namespace component_updater