Remove frog from the repository.

frog/tests/await/while_loop_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 loop:
-
-#import("await_test_helper.dart");
-
-main() {
-  var x = 0;
-  while (x < 3) {
-    final f = futureOf(1);
-    final t = await f;
-    x += t;
-  }
-  Expect.equals(x, 3);
-}
-
-// This is roughly equivalent to:
-// main() {
-//   final _ret = new Completer();
-//   var x = 0;
-//   _after_loop_1() {
-//     Expect.equals(x, 3);
-//     _ret.complete(null);
-//   }
-//   _loop_1() {
-//     while (x < 3) {
-//       final f = futureOf(1);
-//       f.then((t) {
-//         x += t;
-//         _loop_1();
-//       });
-//       Futures.propagateError(f, _ret);
-//       return;
-//     }
-//     _after_loop_1();
-//   }();
-//   return _ret;
-// }