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

components/prefs/json_pref_store.h

 // 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.
 
 #ifndef COMPONENTS_PREFS_JSON_PREF_STORE_H_
 #define COMPONENTS_PREFS_JSON_PREF_STORE_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <set>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/files/important_file_writer.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
+#include "base/sequence_checker.h"
 #include "base/task_scheduler/post_task.h"
-#include "base/threading/non_thread_safe.h"
 #include "components/prefs/base_prefs_export.h"
 #include "components/prefs/persistent_pref_store.h"
 #include "components/prefs/pref_filter.h"
 
 class PrefFilter;
 
 namespace base {
 class Clock;
 class DictionaryValue;
 class FilePath;
 class HistogramBase;
 class JsonPrefStoreCallbackTest;
 class JsonPrefStoreLossyWriteTest;
 class SequencedTaskRunner;
 class SequencedWorkerPool;
 class WriteCallbacksObserver;
 class Value;
 FORWARD_DECLARE_TEST(JsonPrefStoreTest, WriteCountHistogramTestBasic);
 FORWARD_DECLARE_TEST(JsonPrefStoreTest, WriteCountHistogramTestSinglePeriod);
 FORWARD_DECLARE_TEST(JsonPrefStoreTest, WriteCountHistogramTestMultiplePeriods);
 FORWARD_DECLARE_TEST(JsonPrefStoreTest, WriteCountHistogramTestPeriodWithGaps);
 }
 
 // A writable PrefStore implementation that is used for user preferences.
 class COMPONENTS_PREFS_EXPORT JsonPrefStore
     : public PersistentPrefStore,
       public base::ImportantFileWriter::DataSerializer,
-      public base::SupportsWeakPtr<JsonPrefStore>,
-      public base::NonThreadSafe {
+      public base::SupportsWeakPtr<JsonPrefStore> {
  public:
   struct ReadResult;
 
   // A pair of callbacks to call before and after the preference file is written
   // to disk.
   using OnWriteCallbackPair =
       std::pair<base::Closure, base::Callback<void(bool success)>>;
 
   // Returns instance of SequencedTaskRunner which guarantees that file
   // operations on the same file will be executed in sequenced order.
@@ skipping 183 matching lines @@
   bool pending_lossy_write_;
   PrefReadError read_error_;
 
   std::set<std::string> keys_need_empty_value_;
 
   bool has_pending_write_reply_ = true;
   base::Closure on_next_successful_write_reply_;
 
   WriteCountHistogram write_count_histogram_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(JsonPrefStore);
 };
 
 #endif  // COMPONENTS_PREFS_JSON_PREF_STORE_H_