Remove frog from the repository.

frog/tests/await/or_normalization_negative_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 boolean || expressions.
-#import("await_test_helper.dart");
-
-main() {
-  // boolean value is correct:
-  Expect.equals(true, await futureOf(true) || await futureOf(false));
-  Expect.equals(false, await futureOf(false) || await futureOf(false));
-  Expect.equals(true, await futureOf(false) || await futureOf(true));
-  Expect.equals(true, await futureOf(true) || await futureOf(true));
-
-  // short-circuit works, second example is important because it shows that not
-  // only the error doesn't occur, but that the expression is not evaluated
-  // altogether.
-  Expect.equals(true, await futureOf(true) || await errorOf("ERROR1"));
-  Expect.equals(true, await futureOf(true) || await () { throw "ERROR2"; }());
-  Expect.fail("fail to ensure that this line is reached");
-}