Remove generated directories with 100s of files.

client/dom/generated/src/frog/IDBObjectStore.dart

-
-class _IDBObjectStoreJs extends _DOMTypeJs implements IDBObjectStore native "*IDBObjectStore" {
-
-  final List<String> indexNames;
-
-  final String keyPath;
-
-  final String name;
-
-  final _IDBTransactionJs transaction;
-
-  _IDBRequestJs add(Dynamic value, [_IDBKeyJs key = null]) native;
-
-  _IDBRequestJs clear() native;
-
-  _IDBRequestJs count([var key_OR_range = null]) native;
-
-  _IDBIndexJs createIndex(String name, String keyPath) native;
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-  _IDBRequestJs delete(var key_OR_keyRange) native;
-
-  void deleteIndex(String name) native;
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-  _IDBRequestJs getObject(_IDBKeyJs key) native '''return this.get(key);''';
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-  _IDBIndexJs index(String name) native;
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-  _IDBRequestJs openCursor([_IDBKeyRangeJs range = null, int direction = null]) native;
-
-  _IDBRequestJs put(Dynamic value, [_IDBKeyJs key = null]) native;
-}