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

components/signin/core/browser/account_tracker_service.h

 // Copyright 2014 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_SIGNIN_CORE_BROWSER_ACCOUNT_TRACKER_SERVICE_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_ACCOUNT_TRACKER_SERVICE_H_
 
 #include <list>
 #include <map>
 #include <string>
 #include <vector>
 
 #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/timer/timer.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/signin/core/browser/account_info.h"
 #include "google_apis/gaia/gaia_auth_util.h"
 
-
 class PrefService;
 class SigninClient;
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 // AccountTrackerService is a KeyedService that retrieves and caches GAIA
 // information about Google Accounts.
-class AccountTrackerService : public KeyedService,
-                              public base::NonThreadSafe {
+class AccountTrackerService : public KeyedService {
  public:
   // Name of the preference property that persists the account information
   // tracked by this service.
   static const char kAccountInfoPref[];
 
   // TODO(mlerman): Remove all references to Profile::kNoHostedDomainFound in
   // favour of this.
   // Value representing no hosted domain in the kProfileHostedDomain preference.
   static const char kNoHostedDomainFound[];
 
@@ skipping 102 matching lines @@
 
   // Gaia id migration.
   bool IsMigratable() const;
   void MigrateToGaiaId();
   void SetMigrationState(AccountIdMigrationState state);
 
   SigninClient* signin_client_;  // Not owned.
   std::map<std::string, AccountState> accounts_;
   base::ObserverList<Observer> observer_list_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(AccountTrackerService);
 };
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_ACCOUNT_TRACKER_SERVICE_H_