Reapply setTimeout change.
This CL is identical to 18555. The reason it will  work now is the corresponding
dartium change has been checked in.

TBR-blois

BUG=

Review URL: https://codereview.chromium.org//12254046

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@18562 260f80e4-7a28-3924-810f-c04153c831b5
18 files changed