workaround for strange bug in Chrome 32

Reflecting on Object's .declarations sometimes fails.
In general we try to stop at Object in Polymer anyway, so for consistency I'm adding that workaround.

R=blois@google.com

Review URL: https://codereview.chromium.org//136043003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@31938 260f80e4-7a28-3924-810f-c04153c831b5
1 file changed