Remove frogsh.

dart/frog/tests/await/src/HelperNegativeTest.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.
-
-// smoke test: Test that the test helper library works correctly (this and
-// HelperTest work together to ensure that).
-
-#import("await_test_helper.dart");
-#import("../../../lib/node/node.dart");
-
-main() {
-  final f = futureOf(3);
-  // futures don't complete immediatelly
-  Expect.equals(false, f.hasValue);
-  setTimeout(() {
-    // this is marked as a negative test, and we include it to ensure that
-    // tests are executed all the way here.
-    Expect.equals(false, f.hasValue);
-  }, 0);
-}