This is a step towards removing support for obsolete default factory classes.
For now, disable tests using obsolete syntax. More will get disabled as support
is completely removed. We may then permanently remove some tests, while updating
and reenabling others whose purpose is not related to default factory classes.
Review URL: https://codereview.chromium.org//11419191
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@15428 260f80e4-7a28-3924-810f-c04153c831b5