Rename unsubscribe to cancel.

tests/lib/async/stream_controller_test.dart

 // Copyright (c) 2011, 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.
 
 // Test the basic StreamController and StreamController.singleSubscription.
 import 'dart:async';
 import 'event_helper.dart';
 
 testController() {
   // Test normal flow.
@@ skipping 15 matching lines @@
   Events sentEvents =
       new Events()..add(42)..error("error")..add("Are you there?");
   sentEvents.replay(c);
   Expect.listEquals(expectedEvents.events, actualEvents.events);
 
   // Test manual unsubscription.
   c = new StreamController();
   expectedEvents = new Events()..add(42)..error("error")..add(37);
   actualEvents = new Events.capture(c, unsubscribeOnError: false);
   expectedEvents.replay(c);
-  actualEvents.subscription.unsubscribe();
+  actualEvents.subscription.cancel();
   c.add("Are you there");  // Not sent to actualEvents.
   Expect.listEquals(expectedEvents.events, actualEvents.events);
 
   // Test filter.
   c = new StreamController();
   expectedEvents = new Events()
     ..add("a string")..add("another string")..close();
   sentEvents = new Events()
     ..add("a string")..add(42)..add("another string")..close();
   actualEvents = new Events.capture(c.where((v) => v is String));
@@ skipping 74 matching lines @@
   Expect.listEquals(expectedEvents.events, actualEvents.events);
 
   // Test subscription changes while firing.
   c = new StreamController();
   var sink = c.sink;
   var stream = c.stream;
   var counter = 0;
   var subscription = stream.listen(null);
   subscription.onData((data) {
     counter += data;
-    subscription.unsubscribe();
+    subscription.cancel();
     stream.listen((data) {
       counter += 10 * data;
     });
     var subscription2 = stream.listen(null);
     subscription2.onData((data) {
       counter += 100 * data;
-      if (data == 4) subscription2.unsubscribe();
+      if (data == 4) subscription2.cancel();
     });
   });
   sink.add(1); // seen by stream 1
   sink.add(2); // seen by stream 10 and 100
   sink.add(3); // -"-
   sink.add(4); // -"-
   sink.add(5); // seen by stream 10
   Expect.equals(1 + 20 + 200 + 30 + 300 + 40 + 400 + 50, counter);
 }
 
@@ skipping 17 matching lines @@
   Events sentEvents =
       new Events()..add(42)..error("error")..add("Are you there?");
   sentEvents.replay(c);
   Expect.listEquals(expectedEvents.events, actualEvents.events);
 
   // Test manual unsubscription.
   c = new StreamController.singleSubscription();
   expectedEvents = new Events()..add(42)..error("error")..add(37);
   actualEvents = new Events.capture(c, unsubscribeOnError: false);
   expectedEvents.replay(c);
-  actualEvents.subscription.unsubscribe();
+  actualEvents.subscription.cancel();
   c.add("Are you there");  // Not sent to actualEvents.
   Expect.listEquals(expectedEvents.events, actualEvents.events);
 
   // Test filter.
   c = new StreamController.singleSubscription();
   expectedEvents = new Events()
     ..add("a string")..add("another string")..close();
   sentEvents = new Events()
     ..add("a string")..add(42)..add("another string")..close();
   actualEvents = new Events.capture(c.where((v) => v is String));
@@ skipping 163 matching lines @@
   actualEvents = new Events.capture(c.distinct((a, b) => a < b));
   sentEvents.replay(c);
   Expect.listEquals(expectedEvents.events, actualEvents.events);
 }
 
 main() {
   testController();
   testSingleController();
   testExtraMethods();
 }