Use constexpr TaskTraits constructor in chrome.

chrome/browser/extensions/api/log_private/log_private_apitest_chromeos.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 <string>
 #include <utility>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/task_scheduler/post_task.h"
@@ skipping 19 matching lines @@
       : test_file_(test_file) {}
 
   ~TestDebugDaemonClient() override {}
 
   void DumpDebugLogs(bool is_compressed,
                      int file_descriptor,
                      const GetDebugLogsCallback& callback) override {
     // dup() is needed as the file descriptor will be closed on the client side.
     base::File* file_param = new base::File(dup(file_descriptor));
     base::PostTaskWithTraitsAndReply(
-        FROM_HERE, base::TaskTraits().MayBlock(),
+        FROM_HERE, {base::MayBlock()},
         base::Bind(&GenerateTestLogDumpFile, test_file_,
                    base::Owned(file_param)),
         base::Bind(callback, true));
   }
 
   static void GenerateTestLogDumpFile(const base::FilePath& test_tar_file,
                                       base::File* file) {
     std::string test_file_content;
     EXPECT_TRUE(base::ReadFileToString(test_tar_file, &test_file_content))
         << "Cannot read content of file " << test_tar_file.value();
@@ skipping 40 matching lines @@
 IN_PROC_BROWSER_TEST_F(LogPrivateApiTest, DumpLogsAndCaptureEvents) {
   // Setup dummy HTTP server.
   embedded_test_server()->RegisterRequestHandler(
       base::Bind(&LogPrivateApiTest::HandleRequest, base::Unretained(this)));
   ASSERT_TRUE(StartEmbeddedTestServer());
 
   ASSERT_TRUE(RunExtensionTest("log_private/dump_logs"));
 }
 
 }  // namespace extensions