Replace deprecated base::NonThreadSafe in chrome/browser/chromeos/policy in favor of SequenceChecke…

chrome/browser/chromeos/policy/cloud_external_data_manager_base.h

 // Copyright 2013 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 CHROME_BROWSER_CHROMEOS_POLICY_CLOUD_EXTERNAL_DATA_MANAGER_BASE_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_CLOUD_EXTERNAL_DATA_MANAGER_BASE_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "components/policy/core/common/cloud/cloud_external_data_manager.h"
 #include "components/policy/core/common/policy_details.h"
 
 namespace base {
 class SequencedTaskRunner;
 }
 
 namespace policy {
 
 class CloudExternalDataStore;
 class ExternalPolicyDataFetcherBackend;
 
 // Downloads, verifies, caches and retrieves external data referenced by
 // policies.
 // This is a common base class used by specializations for regular users and
 // device-local accounts.
-class CloudExternalDataManagerBase : public CloudExternalDataManager,
-                                     public base::NonThreadSafe {
+class CloudExternalDataManagerBase : public CloudExternalDataManager {
  public:
   // |get_policy_details| is used to determine the maximum size that the
   // data referenced by each policy can have. Download scheduling, verification,
   // caching and retrieval tasks are done via the |backend_task_runner|, which
   // must support file I/O. Network I/O is done via the |io_task_runner|.
   CloudExternalDataManagerBase(
       const GetChromePolicyDetailsCallback& get_policy_details,
       scoped_refptr<base::SequencedTaskRunner> backend_task_runner,
       scoped_refptr<base::SequencedTaskRunner> io_task_runner);
   ~CloudExternalDataManagerBase() override;
@@ skipping 41 matching lines @@
   std::unique_ptr<ExternalPolicyDataFetcherBackend>
       external_policy_data_fetcher_backend_;
 
   // The |backend_| handles all data download scheduling, verification, caching
   // and retrieval. It is instantiated on the thread |this| runs on but after
   // that, must only be accessed and eventually destroyed via the
   // |backend_task_runner_|.
   class Backend;
   std::unique_ptr<Backend> backend_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(CloudExternalDataManagerBase);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_CLOUD_EXTERNAL_DATA_MANAGER_BASE_H_