Convert //sync from scoped_ptr to std::unique_ptr

sync/engine/worker_entity_tracker.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 SYNC_ENGINE_WORKER_ENTITY_TRACKER_H_
 #define SYNC_ENGINE_WORKER_ENTITY_TRACKER_H_
 
 #include <stdint.h>
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "sync/base/sync_export.h"
 #include "sync/protocol/sync.pb.h"
 
 namespace syncer_v2 {
 struct CommitRequestData;
 struct UpdateResponseData;
 
 // Manages the pending commit and update state for an entity on the sync
 // thread.
@@ skipping 82 matching lines @@
 
   // Used to track in-flight commit requests on the model thread.  All we need
   // to do here is return it back to the model thread when the pending commit
   // is completed and confirmed.  Not valid if no commit is pending.
   int64_t sequence_number_;
 
   // The server version on which this item is based.
   int64_t base_version_;
 
   // A commit for this entity waiting for a sync cycle to be committed.
-  scoped_ptr<CommitRequestData> pending_commit_;
+  std::unique_ptr<CommitRequestData> pending_commit_;
 
   // An update for this entity which can't be applied right now. The presence
   // of an pending update prevents commits.  As of this writing, the only
   // source of pending updates is updates that can't currently be decrypted.
-  scoped_ptr<UpdateResponseData> encrypted_update_;
+  std::unique_ptr<UpdateResponseData> encrypted_update_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkerEntityTracker);
 };
 
 }  // namespace syncer_v2
 
 #endif  // SYNC_ENGINE_WORKER_ENTITY_TRACKER_H_