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 89788df4c6778696bfd1abd1aff103787ecfd9e5..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);
 
@@ -128,14 +128,14 @@ testController() {
   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
@@ -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);