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

components/sync_preferences/pref_model_associator.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_SYNC_PREFERENCES_PREF_MODEL_ASSOCIATOR_H_
 #define COMPONENTS_SYNC_PREFERENCES_PREF_MODEL_ASSOCIATOR_H_
 
 #include <map>
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "components/sync/model/sync_data.h"
 #include "components/sync/model/syncable_service.h"
 #include "components/sync_preferences/synced_pref_observer.h"
 
 namespace base {
 class Value;
 }
 
 namespace sync_pb {
 class PreferenceSpecifics;
 }
 
 namespace sync_preferences {
 
 class PrefModelAssociatorClient;
 class PrefServiceSyncable;
 
 // Contains all preference sync related logic.
 // TODO(sync): Merge this into PrefService once we separate the profile
 // PrefService from the local state PrefService.
-class PrefModelAssociator : public syncer::SyncableService,
-                            public base::NonThreadSafe {
+class PrefModelAssociator : public syncer::SyncableService {
  public:
   // Constructs a PrefModelAssociator initializing the |client_| and |type_|
   // instance variable. The |client| is not owned by this object and the caller
   // must ensure that it oulives the PrefModelAssociator.
   PrefModelAssociator(const PrefModelAssociatorClient* client,
                       syncer::ModelType type);
   ~PrefModelAssociator() override;
 
   // See description above field for details.
   bool models_associated() const { return models_associated_; }
@@ skipping 142 matching lines @@
   using SyncedPrefObserverMap =
       base::hash_map<std::string, std::unique_ptr<SyncedPrefObserverList>>;
 
   void NotifySyncedPrefObservers(const std::string& path, bool from_sync) const;
 
   SyncedPrefObserverMap synced_pref_observers_;
   const PrefModelAssociatorClient* client_;  // Weak.
 
   std::vector<base::Closure> callback_list_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(PrefModelAssociator);
 };
 
 }  // namespace sync_preferences
 
 #endif  // COMPONENTS_SYNC_PREFERENCES_PREF_MODEL_ASSOCIATOR_H_