Remove private class helping the parser to construct literal lists and maps.

runtime/lib/literal_factory.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.
-
-// Factory classes constructing mutable List and Map objects from parser
-// generated list and map literals.
-
-class _ListLiteralFactory<E> {
-  // [elements] contains elements that are already type checked.
-  factory List.fromLiteral(List elements) {
-    var list = new List<E>();
-    if (elements.length > 0) {
-      list._setData(elements);
-      list.length = elements.length;
-    }
-    return list;
-  }
-}
-
-// Factory class constructing mutable List and Map objects from parser generated
-// list and map literals.
-
-class _MapLiteralFactory<K, V> {
-  // [elements] contains n key-value pairs.
-  // The keys are at position 2*n and are already type checked by the parser
-  // in checked mode.
-  // The values are at position 2*n+1 and are not yet type checked.
-  factory Map.fromLiteral(List elements) {
-    var map = new LinkedHashMap<String, V>();
-    var len = elements.length;
-    for (int i = 1; i < len; i += 2) {
-      map[elements[i - 1]] = elements[i];
-    }
-    return map;
-  }
-}
-