Revert "Add Zone support for Timers."
Revert "Add zone support to streams."
Revert "catchErrors and waitForCompletion now based on runZonedExperimental."
This reverts commit r24034.
This reverts commit r24035.
This reverts commit r24036.
This reverts commit r24037.
Review URL: https://codereview.chromium.org//17064008
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@24042 260f80e4-7a28-3924-810f-c04153c831b5