SyncFS: Factor out DriveMetadataDB migration functions

chrome/browser/sync_file_system/drive/metadata_db_migration_util.h

 // Copyright 2013 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 CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_METADATA_DB_MIGRATION_UTIL_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_METADATA_DB_MIGRATION_UTIL_H_
 
 #include <string>
 
 #include "chrome/browser/sync_file_system/sync_file_system.pb.h"
@@ skipping 15 matching lines @@
 std::string AddWapiIdPrefix(const std::string& resource_id,
                             DriveMetadata_ResourceType type);
 
 // Removes a prefix from WAPI resource ID.
 // EXAMPLE:
 //   "file:xxx"    =>  "xxx"
 //   "folder:yyy"  =>  "yyy"
 //   "zzz"         =>  "zzz"
 std::string RemoveWapiIdPrefix(const std::string& resource_id);
 
+// Migrate |db| scheme from version 0 to version 1.
+SyncStatusCode MigrateDatabaseFromV0ToV1(leveldb::DB* db);
+
 // Migrate |db| scheme from version 1 to version 2.
 SyncStatusCode MigrateDatabaseFromV1ToV2(leveldb::DB* db);
 
 }  // namespace drive
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_METADATA_DB_MIGRATION_UTIL_H_