Rename unsubscribe to cancel.

sdk/lib/async/stream_controller.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.
 
 // part of dart.async;
 
 // -------------------------------------------------------------------
 // Default implementation of a stream with a controller for adding
 // events to the stream.
 // -------------------------------------------------------------------
@@ skipping 38 matching lines @@
   /**
    * A controller with a [stream] that supports only one single subscriber.
    * The controller will buffer all incoming events until the subscriber is
    * registered.
    */
   StreamController.singleSubscription() {
     _stream = new _SingleControllerStream<T>(onSubscriptionStateChange,
                                              onPauseStateChange);
   }
 
-  StreamSubscription subscribe({void onData(T data),
-                                void onError(AsyncError error),
-                                void onDone(),
-                                bool unsubscribeOnError}) {
-    return _stream.subscribe(onData: onData,
-                             onError: onError,
-                             onDone: onDone,
-                             unsubscribeOnError: unsubscribeOnError);
+  StreamSubscription listen(void onData(T data),
+                            { void onError(AsyncError error),
+                              void onDone(),
+                              bool unsubscribeOnError}) {
+    return _stream.listen(onData,
+                          onError: onError,
+                          onDone: onDone,
+                          unsubscribeOnError: unsubscribeOnError);
   }
 
   /**
    * Returns a view of this object that only exposes the [StreamSink] interface.
    */
   StreamSink<T> get sink => new StreamSinkView<T>(this);
 
   /** Whether one or more active subscribers have requested a pause. */
   bool get isPaused => _stream._isPaused;
 
@@ skipping 70 matching lines @@
   _SingleControllerStream(this._subscriptionHandler, this._pauseHandler);
 
   void _onSubscriptionStateChange() {
     _subscriptionHandler();
   }
 
   void _onPauseStateChange() {
     _pauseHandler();
   }
 }