Format all tests.

tests/lib/async/stream_iterator_double_cancel_test.dart

Index: tests/lib/async/stream_iterator_double_cancel_test.dart
diff --git a/tests/lib/async/stream_iterator_double_cancel_test.dart b/tests/lib/async/stream_iterator_double_cancel_test.dart
index 16bb5730c7ddd4ca4b912cfbb14348926e3d2c24..d648e0d2958e8830b6c543a36cc48c2644494095 100644
--- a/tests/lib/async/stream_iterator_double_cancel_test.dart
+++ b/tests/lib/async/stream_iterator_double_cancel_test.dart
@@ -18,6 +18,7 @@ Stream timedStream(int n) {
     i++;
     new Future.delayed(new Duration(milliseconds: 0), tick);
   }
+
   controller = new StreamController(onListen: tick);
   return controller.stream;
 }
@@ -34,5 +35,6 @@ void main() {
       iterator.moveNext().then(helper);
     }
   }
+
   iterator.moveNext().then(helper);
-}
+}