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

components/prefs/pref_service.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.
 
 // This provides a way to access the application's current preferences.
 
 // Chromium settings and storage represent user-selected preferences and
 // information and MUST not be extracted, overwritten or modified except
 // through Chromium defined APIs.
 
 #ifndef COMPONENTS_PREFS_PREF_SERVICE_H_
 #define COMPONENTS_PREFS_PREF_SERVICE_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <set>
 #include <string>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "base/values.h"
 #include "components/prefs/base_prefs_export.h"
 #include "components/prefs/persistent_pref_store.h"
 
 class PrefNotifier;
 class PrefNotifierImpl;
 class PrefObserver;
 class PrefRegistry;
 class PrefValueStore;
 class PrefStore;
@@ skipping 11 matching lines @@
 class ScopedUserPrefUpdateBase;
 }
 
 // Base class for PrefServices. You can use the base class to read and
 // interact with preferences, but not to register new preferences; for
 // that see e.g. PrefRegistrySimple.
 //
 // Settings and storage accessed through this class represent
 // user-selected preferences and information and MUST not be
 // extracted, overwritten or modified except through the defined APIs.
-class COMPONENTS_PREFS_EXPORT PrefService : public base::NonThreadSafe {
+class COMPONENTS_PREFS_EXPORT PrefService {
  public:
   enum PrefInitializationStatus {
     INITIALIZATION_STATUS_WAITING,
     INITIALIZATION_STATUS_SUCCESS,
     INITIALIZATION_STATUS_CREATED_NEW_PREF_STORE,
     INITIALIZATION_STATUS_ERROR
   };
 
   enum IncludeDefaults {
     INCLUDE_DEFAULTS,
@@ skipping 321 matching lines @@
   // not need to find or create a Preference object to get the
   // value (GetValue() calls back though the preference service to
   // actually get the value.).
   const base::Value* GetPreferenceValue(const std::string& path) const;
 
   // Local cache of registered Preference objects. The pref_registry_
   // is authoritative with respect to what the types and default values
   // of registered preferences are.
   mutable PreferenceMap prefs_map_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(PrefService);
 };
 
 #endif  // COMPONENTS_PREFS_PREF_SERVICE_H_