Remove more multi-thread support. Sorry about how hard it is to review this; diff doesn't handle this kind of change very well.
Remove more multi-thread support. Sorry about how hard it is to review this; diff doesn't handle this kind of change very well.

The assumption is that tasks cannot be interrupted in the single-threaded world of Dart so we no longer need to guard against the case where the state of analysis has changed while executing a task. Please think carefully about the assumption and also check carefully that I have not made any mistakes while making this change (the tests all run, but I'm not sure how well tested this portion of the code base is).

R=scheglov@google.com

Review URL: https://codereview.chromium.org//647033002

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@41051 260f80e4-7a28-3924-810f-c04153c831b5

dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk