Move isolate tests to lib/isolate.

tests/lib/async/deferred/deferred_in_isolate_test.dart

Index: tests/lib/async/deferred/deferred_in_isolate_test.dart
diff --git a/tests/lib/async/deferred/deferred_in_isolate_test.dart b/tests/lib/async/deferred/deferred_in_isolate_test.dart
deleted file mode 100644
index 08cd0dae0034c8f5a519e8bbb35315ca6050c29a..0000000000000000000000000000000000000000
--- a/tests/lib/async/deferred/deferred_in_isolate_test.dart
+++ /dev/null
@@ -1,21 +0,0 @@
-import 'dart:isolate';
-import 'dart:async';
-import 'package:unittest/unittest.dart';
-
-import 'deferred_in_isolate_lib.dart' deferred as lib;
-
-loadDeferred(port) {
-  lib.loadLibrary().then((_) {
-    port.send(lib.f());
-  });
-}
-
-main() {
-  test("Deferred loading in isolate", () {
-    ReceivePort port = new ReceivePort();
-    port.first.then(expectAsync((msg) {
-       expect(msg, equals("hi"));
-    }));
-    Isolate.spawn(loadDeferred, port.sendPort);
-  });
-}