Deprecate NonThreadSafe in components/bookmarks in favor of SequenceChecker.

components/bookmarks/browser/startup_task_runner_service.h

 // Copyright (c) 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 COMPONENTS_BOOKMARKS_BROWSER_STARTUP_TASK_RUNNER_SERVICE_H_
 #define COMPONENTS_BOOKMARKS_BROWSER_STARTUP_TASK_RUNNER_SERVICE_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/keyed_service/core/keyed_service.h"
 
 namespace base {
 class DeferredSequencedTaskRunner;
 class SequencedTaskRunner;
 }  // namespace base
 
 namespace bookmarks {
 
 // This service manages the startup task runners.
-class StartupTaskRunnerService : public base::NonThreadSafe,
-                                 public KeyedService {
+class StartupTaskRunnerService : public KeyedService {
  public:
   explicit StartupTaskRunnerService(
       const scoped_refptr<base::SequencedTaskRunner>& io_task_runner);
   ~StartupTaskRunnerService() override;
 
   // Returns sequenced task runner where all bookmarks I/O operations are
   // performed.
   // This method should only be called from the UI thread.
   // Note: Using a separate task runner per profile service gives a better
   // management of the sequence in which the task are started in order to avoid
   // congestion during start-up (e.g the caller may decide to start loading the
   // bookmarks only after the history finished).
   scoped_refptr<base::DeferredSequencedTaskRunner> GetBookmarkTaskRunner();
 
   // Starts the task runners that are deferred during start-up.
   void StartDeferredTaskRunners();
 
  private:
   scoped_refptr<base::SequencedTaskRunner> io_task_runner_;
   scoped_refptr<base::DeferredSequencedTaskRunner> bookmark_task_runner_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(StartupTaskRunnerService);
 };
 
 }  // namespace bookmarks
 
 #endif  // COMPONENTS_BOOKMARKS_BROWSER_STARTUP_TASK_RUNNER_SERVICE_H_