Rename unsubscribeOnError to cancelOnError.

tests/lib/async/event_helper.dart

 // Copyright (c) 2012, 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 event_helper;
 
 import 'dart:async';
 
 abstract class Event {
   void replay(EventSink sink);
@@ skipping 52 matching lines @@
   final List<Event> events = [];
 
   Events();
   Events.fromIterable(Iterable iterable) {
     for (var value in iterable) add(value);
     close();
   }
 
   /** Capture events from a stream into a new [Events] object. */
   factory Events.capture(Stream stream,
-                         { bool unsubscribeOnError: false }) = CaptureEvents;
+                         { bool cancelOnError: false }) = CaptureEvents;
 
   // EventSink interface.
   void add(var value) {
     events.add(new DataEvent(value));
   }
 
   void addError(AsyncError error) {
     events.add(new ErrorEvent(error));
   }
 
@@ skipping 43 matching lines @@
    * Sets an action to be called when this [Events] receives a 'done' event.
    */
   void onDone(void action()) {
      throw new StateError("Not capturing events.");
   }
 }
 
 class CaptureEvents extends Events {
   StreamSubscription subscription;
   Completer onDoneSignal;
-  bool unsubscribeOnError = false;
+  bool cancelOnError = false;
 
   CaptureEvents(Stream stream,
-                { bool unsubscribeOnError: false })
+                { bool cancelOnError: false })
       : onDoneSignal = new Completer() {
-    this.unsubscribeOnError = unsubscribeOnError;
+    this.cancelOnError = cancelOnError;
     subscription = stream.listen(add,
                                  onError: addError,
                                  onDone: close,
-                                 unsubscribeOnError: unsubscribeOnError);
+                                 cancelOnError: cancelOnError);
   }
 
   void addError(AsyncError error) {
     super.addError(error);
-    if (unsubscribeOnError) onDoneSignal.complete(null);
+    if (cancelOnError) onDoneSignal.complete(null);
   }
 
   void close() {
     super.close();
     if (onDoneSignal != null) onDoneSignal.complete(null);
   }
 
   void pause([Future resumeSignal]) {
     subscription.pause(resumeSignal);
   }
 
   void resume() {
     subscription.resume();
   }
 
   void onDone(void action()) {
     onDoneSignal.future.whenComplete(action);
   }
 }