Unify list.

runtime/lib/array_patch.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.
+
+patch class ListImplementation<E> {
+  /* patch */ factory List([int length = null]) {
+    if (length === null) {
+      return new GrowableObjectArray<E>();
+    } else {
+      return new ObjectArray<E>(length);
+    }
+  }
+
+  /* patch */ static _from(Iterable other) {
+    GrowableObjectArray list = new GrowableObjectArray();
+    for (final e in other) {
+      list.add(e);
+    }
+    return list;
+  }
+}