Rename unsubscribeOnError to cancelOnError.

tests/lib/async/stream_state_helper.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library stream_state_helper;
 
 import "../../../pkg/unittest/lib/unittest.dart";
 import "dart:async";
 import "dart:collection";
 
@@ skipping 18 matching lines @@
     _onComplete = expectAsync0((){
       _onComplete = null;  // Being null marks the test to be complete.
     });
   }
 
   // Actions on the stream and controller.
   void add(var data) { _controller.add(data); }
   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]) {
     if (_subscription == null) throw new StateError("Not subscribed");
     _subscription.pause(resumeSignal);
   }
 
   void resume([Future resumeSignal]) {
     if (_subscription == null) throw new StateError("Not subscribed");
     _subscription.resume();
@@ skipping 224 matching lines @@
     _actual = "*[Paused:${c.isPaused}]";
     return true;
   }
   bool _testSubcribe(StreamController c) {
     _actual = "*[Has listener:${c.hasListener}, Paused:${c.isPaused}]";
     return true;
   }
 
   String toString() => _actual;
 }