Deprecate NonThreadSafe in components/sync in favor of SequenceChecker.

components/sync/model_impl/attachments/attachment_service_impl.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_SYNC_MODEL_IMPL_ATTACHMENTS_ATTACHMENT_SERVICE_IMPL_H_
 #define COMPONENTS_SYNC_MODEL_IMPL_ATTACHMENTS_ATTACHMENT_SERVICE_IMPL_H_
 
 #include <deque>
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "components/sync/engine/attachments/attachment_downloader.h"
 #include "components/sync/engine/attachments/attachment_uploader.h"
 #include "components/sync/model/attachments/attachment_service.h"
 #include "components/sync/model/attachments/attachment_service_proxy.h"
 #include "components/sync/model/attachments/attachment_store.h"
 #include "components/sync/model_impl/attachments/task_queue.h"
 #include "net/base/network_change_notifier.h"
 
 namespace syncer {
 
 // Implementation of AttachmentService.
 class AttachmentServiceImpl
     : public AttachmentService,
-      public net::NetworkChangeNotifier::NetworkChangeObserver,
-      public base::NonThreadSafe {
+      public net::NetworkChangeNotifier::NetworkChangeObserver {
  public:
   // |attachment_store| is required. UploadAttachments reads attachment data
   // from it. Downloaded attachments will be written into it.
   //
   // |attachment_uploader| is optional. If null, attachments will never be
   // uploaded to the sync server and |delegate|'s OnAttachmentUploaded will
   // never be invoked.
   //
   // |attachment_downloader| is optional. If null, attachments will never be
   // downloaded. Only attachments in |attachment_store| will be returned from
@@ skipping 63 matching lines @@
   const std::unique_ptr<AttachmentUploader> attachment_uploader_;
 
   // May be null.
   const std::unique_ptr<AttachmentDownloader> attachment_downloader_;
 
   // May be null.
   Delegate* delegate_;
 
   std::unique_ptr<TaskQueue<AttachmentId>> upload_task_queue_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   // Must be last data member.
   base::WeakPtrFactory<AttachmentServiceImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AttachmentServiceImpl);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_MODEL_IMPL_ATTACHMENTS_ATTACHMENT_SERVICE_IMPL_H_