Deprecate NonThreadSafe in components/sync in favor of SequenceChecker.

components/sync/engine/attachments/in_memory_attachment_store.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_ENGINE_ATTACHMENTS_IN_MEMORY_ATTACHMENT_STORE_H_
 #define COMPONENTS_SYNC_ENGINE_ATTACHMENTS_IN_MEMORY_ATTACHMENT_STORE_H_
 
 #include <map>
 #include <set>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "components/sync/engine/attachments/attachment_store_backend.h"
 #include "components/sync/model/attachments/attachment.h"
 #include "components/sync/model/attachments/attachment_id.h"
 #include "components/sync/model/attachments/attachment_store.h"
 
 namespace base {
 class SequencedTaskRunner;
 }  // namespace base
 
 namespace syncer {
 
 // An in-memory implementation of AttachmentStore used for testing.
 // InMemoryAttachmentStore is not threadsafe, it lives on backend thread and
 // posts callbacks with results on |callback_task_runner|.
-class InMemoryAttachmentStore : public AttachmentStoreBackend,
-                                public base::NonThreadSafe {
+class InMemoryAttachmentStore : public AttachmentStoreBackend {
  public:
   InMemoryAttachmentStore(
       const scoped_refptr<base::SequencedTaskRunner>& callback_task_runner);
   ~InMemoryAttachmentStore() override;
 
   // AttachmentStoreBackend implementation.
   void Init(const AttachmentStore::InitCallback& callback) override;
   void Read(AttachmentStore::Component component,
             const AttachmentIdList& ids,
             const AttachmentStore::ReadCallback& callback) override;
@@ skipping 20 matching lines @@
     AttachmentEntry(const AttachmentEntry& other);
     ~AttachmentEntry();
 
     Attachment attachment;
     std::set<AttachmentStore::Component> components;
   };
 
   using AttachmentEntryMap = std::map<AttachmentId, AttachmentEntry>;
   AttachmentEntryMap attachments_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(InMemoryAttachmentStore);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_ATTACHMENTS_IN_MEMORY_ATTACHMENT_STORE_H_