Use constexpr TaskTraits constructor in chrome.

chrome/browser/extensions/extension_browsertest.cc

 // Copyright (c) 2012 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/extensions/extension_browsertest.h"
 
 #include <stddef.h>
 
 #include <utility>
 #include <vector>
@@ skipping 83 matching lines @@
   std::vector<base::FilePath::StringType> components;
   relative_path.GetComponents(&components);
   DCHECK_GT(components.size(), 1u);
   base::FilePath resource_path = test_dir_root;
   for (size_t i = 1u; i < components.size(); ++i)
     resource_path = resource_path.Append(components[i]);
 
   return new net::URLRequestFileJob(
       request, network_delegate, resource_path,
       base::CreateTaskRunnerWithTraits(
-          base::TaskTraits()
-              .MayBlock()
-              .WithPriority(base::TaskPriority::BACKGROUND)
-              .WithShutdownBehavior(
-                  base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN)));
+          {base::MayBlock(), base::TaskPriority::BACKGROUND,
+           base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN}));
 }
 
 }  // namespace
 
 ExtensionBrowserTest::ExtensionBrowserTest()
     : loaded_(false),
       installed_(false),
 #if defined(OS_CHROMEOS)
       set_chromeos_user_(true),
 #endif
@@ skipping 493 matching lines @@
   return extensions::browsertest_util::ExecuteScriptInBackgroundPage(
       profile(), extension_id, script);
 }
 
 bool ExtensionBrowserTest::ExecuteScriptInBackgroundPageNoWait(
     const std::string& extension_id,
     const std::string& script) {
   return extensions::browsertest_util::ExecuteScriptInBackgroundPageNoWait(
       profile(), extension_id, script);
 }