Convert //sync from scoped_ptr to std::unique_ptr

sync/internal_api/public/sessions/sync_session_snapshot.h

 // Copyright 2012 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_INTERNAL_API_PUBLIC_SESSIONS_SYNC_SESSION_SNAPSHOT_H_
 #define SYNC_INTERNAL_API_PUBLIC_SESSIONS_SYNC_SESSION_SNAPSHOT_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 30 matching lines @@
       bool notifications_enabled,
       size_t num_entries,
       base::Time sync_start_time,
       base::Time poll_finish_time,
       const std::vector<int>& num_entries_by_type,
       const std::vector<int>& num_to_delete_entries_by_type,
       sync_pb::GetUpdatesCallerInfo::GetUpdatesSource legacy_updates_source);
   SyncSessionSnapshot(const SyncSessionSnapshot& other);
   ~SyncSessionSnapshot();
 
-  scoped_ptr<base::DictionaryValue> ToValue() const;
+  std::unique_ptr<base::DictionaryValue> ToValue() const;
 
   std::string ToString() const;
 
   ModelNeutralState model_neutral_state() const {
     return model_neutral_state_;
   }
   const ProgressMarkerMap& download_progress_markers() const;
   bool is_silenced() const;
   int num_encryption_conflicts() const;
   int num_hierarchy_conflicts() const;
@@ skipping 29 matching lines @@
   // still some value in displaying it on the about:sync page.
   sync_pb::GetUpdatesCallerInfo::GetUpdatesSource legacy_updates_source_;
 
   bool is_initialized_;
 };
 
 }  // namespace sessions
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_SESSIONS_SYNC_SESSION_SNAPSHOT_H_