Remove generated directories with 100s of files.

client/dom/generated/src/interface/IDBIndex.dart

-// 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: Do not edit - generated code.
-
-interface IDBIndex {
-
-  final String keyPath;
-
-  final bool multiEntry;
-
-  final String name;
-
-  final IDBObjectStore objectStore;
-
-  final bool unique;
-
-  IDBRequest count([var key_OR_range]);
-
-  IDBRequest getObject(IDBKey key);
-
-  IDBRequest getKey(IDBKey key);
-
-  IDBRequest openCursor([IDBKeyRange range, int direction]);
-
-  IDBRequest openKeyCursor([IDBKeyRange range, int direction]);
-}