Replace deprecated base::NonThreadSafe in components/reading_list in favor of SequenceChecker.

components/reading_list/core/reading_list_store.h

 // Copyright 2016 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.
 
 #ifndef COMPONENTS_READING_LIST_CORE_READING_LIST_STORE_H_
 #define COMPONENTS_READING_LIST_CORE_READING_LIST_STORE_H_
 
 #include <memory>
 #include <string>
 
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "components/reading_list/core/reading_list_model_storage.h"
 #include "components/reading_list/core/reading_list_store_delegate.h"
 #include "components/sync/model/model_error.h"
 #include "components/sync/model/model_type_store.h"
 
 namespace syncer {
 class MutableDataBatch;
 }
 
 class ReadingListModel;
 
 // A ReadingListModelStorage storing and syncing data in protobufs.
-class ReadingListStore : public ReadingListModelStorage,
-                         public base::NonThreadSafe {
+class ReadingListStore : public ReadingListModelStorage {
   using StoreFactoryFunction = base::Callback<void(
       const syncer::ModelTypeStore::InitCallback& callback)>;
 
  public:
   ReadingListStore(StoreFactoryFunction create_store_callback,
                    const ChangeProcessorFactory& change_processor_factory);
   ~ReadingListStore() override;
 
   std::unique_ptr<ScopedBatchUpdate> EnsureBatchCreated() override;
 
@@ skipping 125 matching lines @@
   std::unique_ptr<syncer::ModelTypeStore> store_;
   ReadingListModel* model_;
   ReadingListStoreDelegate* delegate_;
   StoreFactoryFunction create_store_callback_;
 
   int pending_transaction_count_;
   std::unique_ptr<syncer::ModelTypeStore::WriteBatch> batch_;
 
   base::Clock* clock_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(ReadingListStore);
 };
 
 #endif  // COMPONENTS_READING_LIST_CORE_READING_LIST_STORE_H_