Remove frog from the repository.

frog/tests/await/nested_function_test.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// The next line is used to tell test.dart that this test is run by invoking
-// awaitc.dart and passing this file as an argument (e.g. frog
-// frog/await/awaitc.dart test.dart):
-// VMOptions=frog/await/awaitc.dart
-
-// Await within a lambda function.
-
-#import("await_test_helper.dart");
-
-main() {
-  bool called = false;
-  final f2 = () {
-    final f = futureOf(3);
-    final x = await f;
-    Expect.equals(3, x);
-    called = true;
-  }();
-  Expect.equals(false, called);
-  await f2;
-  Expect.equals(true, called);
-}
-
-// This is roughly equivalent to:
-// main() {
-//   final _ret0 = new Completer();
-//   final f2 = (function() {
-//     final _ret1 = new Completer();
-//     final f = futureOf(3);
-//     f.then((x) {
-//       Expect.equals(3, x);
-//       called = true;
-//       _ret.complete(null);
-//     });
-//     Futures.propagateError(f, _ret);
-//     return _ret1.future;
-//   })();
-//  Expect.equals(false, called);
-//  f2.then((v) {
-//    Expect.equals(true, called);
-//  });
-//  return _ret0.future;
-// }