Rename unsubscribe to cancel.

tests/lib/async/stream_controller_async_test.dart

Index: tests/lib/async/stream_controller_async_test.dart
diff --git a/tests/lib/async/stream_controller_async_test.dart b/tests/lib/async/stream_controller_async_test.dart
index 6efa9b69a9bfe6a94740aa54ee4520161a4d767e..3c65a7e87f981d2b2d7718586d34a46535622828 100644
--- a/tests/lib/async/stream_controller_async_test.dart
+++ b/tests/lib/async/stream_controller_async_test.dart
@@ -80,11 +80,11 @@ testSingleController() {
     Stream stream = c.stream;
     int counter = 0;
     var subscription;
-    subscription = stream.subscribe(onData: (data) {
+    subscription = stream.listen((data) {
       counter += data;
-      Expect.throws(() => stream.subscribe(), (e) => e is StateError);
-      subscription.unsubscribe();
-      stream.subscribe(onData: (data) {
+      Expect.throws(() => stream.listen(null), (e) => e is StateError);
+      subscription.cancel();
+      stream.listen((data) {
         counter += data * 10;
       },
       onDone: expectAsync0(() {
@@ -106,8 +106,8 @@ testSingleController() {
     sink.add(1);
     sink.add(2);
     sink.close();
-    stream.subscribe(
-      onData: (data) {
+    stream.listen(
+      (data) {
         counter += data;
       },
       onDone: expectAsync0(() {
@@ -122,17 +122,17 @@ testSingleController() {
     StreamSink sink = c.sink;
     Stream stream = c.stream;
     int counter = 0;
-    var subscription = stream.subscribe();
+    var subscription = stream.listen(null);
     subscription.onData(expectAsync1((data) {
       counter += data;
-      subscription.unsubscribe();
-      stream.subscribe(onData: (data) {
+      subscription.cancel();
+      stream.listen((data) {
         counter += 10 * data;
       },
       onDone: expectAsync0(() {
         Expect.equals(1 + 20 + 30 + 40 + 50, counter);
       }));
-      Expect.throws(() => stream.subscribe(), (e) => e is StateError);
+      Expect.throws(() => stream.listen(null), (e) => e is StateError);
     }));
     sink.add(1); // seen by stream 1
     sink.add(2); // seen by stream 10 and 100