Convert //sync from scoped_ptr to std::unique_ptr

sync/syncable/directory_backing_store.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_SYNCABLE_DIRECTORY_BACKING_STORE_H_
 #define SYNC_SYNCABLE_DIRECTORY_BACKING_STORE_H_
 
 #include <stdint.h>
 
+#include <memory>
 #include <string>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "sql/connection.h"
 #include "sql/statement.h"
 #include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/syncable/dir_open_result.h"
 #include "sync/syncable/directory.h"
 #include "sync/syncable/metahandle_set.h"
 
 namespace sync_pb {
@@ skipping 217 matching lines @@
   // Returns true on success, false on error.
   bool UpdatePageSizeIfNecessary();
 
   // Prepares |save_statement| for saving entries in |table|.
   void PrepareSaveEntryStatement(EntryTable table,
                                  sql::Statement* save_statement);
 
   const std::string dir_name_;
   const int database_page_size_;
 
-  scoped_ptr<sql::Connection> db_;
+  std::unique_ptr<sql::Connection> db_;
   sql::Statement save_meta_statement_;
   sql::Statement save_delete_journal_statement_;
 
   // Set to true if migration left some old columns around that need to be
   // discarded.
   bool needs_metas_column_refresh_;
   bool needs_share_info_column_refresh_;
 
   // We keep a copy of the Closure so we reinstall it when the underlying
   // sql::Connection is destroyed/recreated.
   base::Closure catastrophic_error_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectoryBackingStore);
 };
 
 }  // namespace syncable
 }  // namespace syncer
 
 #endif  // SYNC_SYNCABLE_DIRECTORY_BACKING_STORE_H_