Do not set debug Dart flags when running the test.

Do not set debug Dart flags when running the test.

BUG=1113
Committed: https://code.google.com/p/dart/source/detail?r=3149

[Anton Muhin, 2012-01-10 15:40:33]

Dan,

I hope this will solve http://code.google.com/p/dart/issues/detail?id=1113, but
even if not, it should be benign anyway.

[dgrove, 2012-01-10 15:41:23]

lgtm