Use constexpr TaskTraits constructor everywhere.

components/sync/model_impl/model_type_store_impl.cc

 // Copyright 2015 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/sync/model_impl/model_type_store_impl.h"
 
 #include <map>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 50 matching lines @@
 class TaskRunnerMap {
  public:
   TaskRunnerMap() = default;
 
   scoped_refptr<base::SequencedTaskRunner> GetOrCreateTaskRunner(
       const std::string& path) {
     base::AutoLock scoped_lock(lock_);
     auto iter = task_runner_map_.find(path);
     if (iter == task_runner_map_.end()) {
       scoped_refptr<base::SequencedTaskRunner> task_runner =
-          CreateSequencedTaskRunnerWithTraits(
-              base::TaskTraits().MayBlock().WithShutdownBehavior(
-                  base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN));
+          base::CreateSequencedTaskRunnerWithTraits(
+              {base::MayBlock(), base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN});
       task_runner_map_[path] = task_runner;
       return task_runner;
     } else {
       return iter->second;
     }
   }
 
  private:
   mutable base::Lock lock_;
   std::map<std::string, scoped_refptr<base::SequencedTaskRunner>>
@@ skipping 331 matching lines @@
 }
 
 ModelTypeStoreImpl::WriteBatchImpl::WriteBatchImpl(ModelTypeStore* store)
     : WriteBatch(store) {
   leveldb_write_batch_ = base::MakeUnique<leveldb::WriteBatch>();
 }
 
 ModelTypeStoreImpl::WriteBatchImpl::~WriteBatchImpl() {}
 
 }  // namespace syncer