Rename unsubscribe to cancel.

tests/lib/async/future_test.dart

Index: tests/lib/async/future_test.dart
diff --git a/tests/lib/async/future_test.dart b/tests/lib/async/future_test.dart
index 93c493ca55a1a6775ae76047e4056aab51aa6b24..28894f5d1a1143411b7d0b3d77d631306c3f611d 100644
--- a/tests/lib/async/future_test.dart
+++ b/tests/lib/async/future_test.dart
@@ -9,8 +9,8 @@ testFutureAsStreamCompleteAfter() {
   var completer = new Completer();
   bool gotValue = false;
   var port = new ReceivePort();
-  completer.future.asStream().subscribe(
-      onData: (data) {
+  completer.future.asStream().listen(
+      (data) {
         Expect.isFalse(gotValue);
         gotValue = true;
         Expect.equals("value", data);
@@ -27,8 +27,8 @@ testFutureAsStreamCompleteBefore() {
   bool gotValue = false;
   var port = new ReceivePort();
   completer.complete("value");
-  completer.future.asStream().subscribe(
-      onData: (data) {
+  completer.future.asStream().listen(
+      (data) {
         Expect.isFalse(gotValue);
         gotValue = true;
         Expect.equals("value", data);
@@ -42,8 +42,8 @@ testFutureAsStreamCompleteBefore() {
 testFutureAsStreamCompleteImmediate() {
   bool gotValue = false;
   var port = new ReceivePort();
-  new Future.immediate("value").asStream().subscribe(
-      onData: (data) {
+  new Future.immediate("value").asStream().listen(
+      (data) {
         Expect.isFalse(gotValue);
         gotValue = true;
         Expect.equals("value", data);
@@ -58,8 +58,8 @@ testFutureAsStreamCompleteErrorAfter() {
   var completer = new Completer();
   bool gotError = false;
   var port = new ReceivePort();
-  completer.future.asStream().subscribe(
-      onData: (data) {
+  completer.future.asStream().listen(
+      (data) {
         Expect.fail("Unexpected data");
       },
       onError: (error) {
@@ -81,8 +81,8 @@ testFutureAsStreamWrapper() {
   completer.complete("value");
   completer.future
       .catchError((_) { throw "not possible"; })  // Returns a future wrapper.
-      .asStream().subscribe(
-        onData: (data) {
+      .asStream().listen(
+        (data) {
           Expect.isFalse(gotValue);
           gotValue = true;
           Expect.equals("value", data);