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

components/signin/core/browser/account_fetcher_service.h

 // Copyright 2015 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_FETCHER_SERVICE_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_ACCOUNT_FETCHER_SERVICE_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <unordered_map>
 
 #include "base/macros.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 "google_apis/gaia/oauth2_token_service.h"
 
 class AccountInfoFetcher;
 class AccountTrackerService;
 class ChildAccountInfoFetcher;
 class OAuth2TokenService;
 class RefreshTokenAnnotationRequest;
 class SigninClient;
 
 namespace invalidation {
 class InvalidationService;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 class AccountFetcherService : public KeyedService,
-                              public OAuth2TokenService::Observer,
-                              public base::NonThreadSafe {
+                              public OAuth2TokenService::Observer {
  public:
   // Name of the preference that tracks the int64_t representation of the last
   // time the AccountTrackerService was updated.
   static const char kLastUpdatePref[];
 
   AccountFetcherService();
   ~AccountFetcherService() override;
 
   // Registers the preferences used by AccountFetcherService.
   static void RegisterPrefs(user_prefs::PrefRegistrySyncable* user_prefs);
@@ skipping 85 matching lines @@
   std::unique_ptr<ChildAccountInfoFetcher> child_info_request_;
 
   // Holds references to account info fetchers keyed by account_id.
   std::unordered_map<std::string, std::unique_ptr<AccountInfoFetcher>>
       user_info_requests_;
   // Holds references to refresh token annotation requests keyed by account_id.
   std::unordered_map<std::string,
                      std::unique_ptr<RefreshTokenAnnotationRequest>>
       refresh_token_annotation_requests_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(AccountFetcherService);
 };
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_ACCOUNT_FETCHER_SERVICE_H_