Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/Database.dartdoc

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// WARNING:
-//   This file contains documentation that is merged into the real source.
-//   Do not make code changes here.
-
-/// @domName Database
-interface Database {
-
-  /** @domName Database.version */
-  final String version;
-
-  /** @domName Database.changeVersion */
-  void changeVersion(String oldVersion, String newVersion, [SQLTransactionCallback callback, SQLTransactionErrorCallback errorCallback, VoidCallback successCallback]);
-
-  /** @domName Database.readTransaction */
-  void readTransaction(SQLTransactionCallback callback, [SQLTransactionErrorCallback errorCallback, VoidCallback successCallback]);
-
-  /** @domName Database.transaction */
-  void transaction(SQLTransactionCallback callback, [SQLTransactionErrorCallback errorCallback, VoidCallback successCallback]);
-}