Rename unsubscribe to cancel.

tests/lib/async/stream_controller_test.dart

Index: tests/lib/async/stream_controller_test.dart
diff --git a/tests/lib/async/stream_controller_test.dart b/tests/lib/async/stream_controller_test.dart
index a20c701cf73745fb1f648d7ff6969d3fc19a2284..e06ec4ad512c92d2775001bac7ae6624c92d5c14 100644
--- a/tests/lib/async/stream_controller_test.dart
+++ b/tests/lib/async/stream_controller_test.dart
@@ -33,7 +33,7 @@ testController() {
   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);
 
@@ -125,17 +125,17 @@ testController() {
   var sink = c.sink;
   var stream = c.stream;
   var counter = 0;
-  var subscription = stream.subscribe();
+  var subscription = stream.listen(null);
   subscription.onData((data) {
     counter += data;
-    subscription.unsubscribe();
-    stream.subscribe(onData: (data) {
+    subscription.cancel();
+    stream.listen((data) {
       counter += 10 * data;
     });
-    var subscription2 = stream.subscribe();
+    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
@@ -173,7 +173,7 @@ testSingleController() {
   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);
 
@@ -277,8 +277,8 @@ testSingleController() {
   var sink = c.sink;
   var stream = c.stream;
   var counter = 0;
-  var subscription = stream.subscribe(onData: (data) { counter += data; });
-  Expect.throws(() => stream.subscribe(), (e) => e is StateError);
+  var subscription = stream.listen((data) { counter += data; });
+  Expect.throws(() => stream.listen(null), (e) => e is StateError);
   sink.add(1);
   Expect.equals(1, counter);
   c.close();