Remove frog from the repository.

frog/tests/await/single_await_normalization_test.dart

Index: frog/tests/await/single_await_normalization_test.dart
diff --git a/frog/tests/await/single_await_normalization_test.dart b/frog/tests/await/single_await_normalization_test.dart
deleted file mode 100644
index d2907f4466ed9e06b0a8f2850bd8183a541086ce..0000000000000000000000000000000000000000
--- a/frog/tests/await/single_await_normalization_test.dart
+++ /dev/null
@@ -1,13 +0,0 @@
-// 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
-
-// Linear not-normalized await expression
-#import("await_test_helper.dart");
-
-main() => Expect.equals(3, await futureOf(3));