Remove frog from the repository.

frog/tests/await/binary_expression_normalization_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 on (non short-circuit, ie not: || &&) binary expressions.
-#import("await_test_helper.dart");
-
-main() {
-  Expect.equals(true, await futureOf(1) < await futureOf(2));
-  Expect.equals(false, await futureOf(1) >= await futureOf(2));
-  Expect.equals(4, await futureOf(1) + await futureOf(3));
-  Expect.equals(1, await futureOf(3) - await futureOf(2));
-  int x;
-  Expect.equals(4, (x = await futureOf(3) + 1));
-  Expect.equals(4, x);
-  Expect.equals(8, (x += await futureOf(3) + 1));
-  Expect.equals(8, x);
-}