Use constexpr TaskTraits constructor in components.

components/translate/core/browser/ranker_model_loader.cc

 // Copyright 2017 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 "components/translate/core/browser/ranker_model_loader.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 82 matching lines @@
 
 }  // namespace
 
 RankerModelLoader::RankerModelLoader(
     ValidateModelCallback validate_model_cb,
     OnModelAvailableCallback on_model_available_cb,
     base::FilePath model_path,
     GURL model_url,
     std::string uma_prefix)
     : background_task_runner_(base::CreateSequencedTaskRunnerWithTraits(
-          base::TaskTraits()
-              .MayBlock()
-              .WithPriority(base::TaskPriority::BACKGROUND)
-              .WithShutdownBehavior(
-                  base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN))),
+          {base::MayBlock(), base::TaskPriority::BACKGROUND,
+           base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN})),
       validate_model_cb_(std::move(validate_model_cb)),
       on_model_available_cb_(std::move(on_model_available_cb)),
       model_path_(std::move(model_path)),
       model_url_(std::move(model_url)),
       uma_prefix_(std::move(uma_prefix)),
       url_fetcher_(base::MakeUnique<TranslateURLFetcher>(kUrlFetcherId)),
       weak_ptr_factory_(this) {}
 
 RankerModelLoader::~RankerModelLoader() {
   DCHECK(sequence_checker_.CalledOnValidSequence());
@@ skipping 185 matching lines @@
       uma_prefix_ + kModelStatusHistogram, 1,
       static_cast<int>(RankerModelStatus::MAX),
       static_cast<int>(RankerModelStatus::MAX) + 1,
       base::HistogramBase::kUmaTargetedHistogramFlag);
   if (histogram)
     histogram->Add(static_cast<int>(model_status));
   return model_status;
 }
 
 }  // namespace translate