Get rid of Chain.track in pub.

Get rid of Chain.track in pub.

R=rnystrom@google.com

Committed: https://code.google.com/p/dart/source/detail?r=40559

[Bob Nystrom, 2014-09-19 18:16:53]

If you want, you could change a lot of these to use async instead of new
Future.sync().

Either way, LGTM++++ fast delivery would accept patch again.

[nweiz, 2014-09-22 17:58:46]

On 2014/09/19 18:16:53, Bob Nystrom wrote:
> If you want, you could change a lot of these to use async instead of new
> Future.sync().

I'd rather keep this patch simple with no functional changes and do that as we
touch the functions.

> Either way, LGTM++++ fast delivery would accept patch again.

[nweiz, 2014-09-22 19:35:57]

Committed patchset #1 (id:1) manually as 40559 (presubmit successful).