Rename unsubscribeOnError to cancelOnError.

tests/lib/async/stream_state_helper.dart

Index: tests/lib/async/stream_state_helper.dart
diff --git a/tests/lib/async/stream_state_helper.dart b/tests/lib/async/stream_state_helper.dart
index b982d9d23be4e82fd13fec277e913907f31fbeac..ac6d94922cb864995f27da4c7f83b2f040da4877 100644
--- a/tests/lib/async/stream_state_helper.dart
+++ b/tests/lib/async/stream_state_helper.dart
@@ -36,15 +36,15 @@ class StreamProtocolTest {
   void error(var error) { _controller.addError(error); }
   void close() { _controller.close(); }
 
-  void subscribe({bool unsubscribeOnError : false}) {
+  void subscribe({bool cancelOnError : false}) {
     // TODO(lrn): Handle more subscriptions (e.g., a subscription-id
     // per subscription, and an id on event _expectations).
     if (_subscription != null) throw new StateError("Already subscribed");
     _subscription = _controller.stream.listen(_onData,
                                               onError: _onError,
                                               onDone: _onDone,
-                                              unsubscribeOnError:
-                                                  unsubscribeOnError);
+                                              cancelOnError:
+                                                  cancelOnError);
   }
 
   void pause([Future resumeSignal]) {