Remove frog from the repository.

frog/tests/await/try_catch10_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 try-catch block, exception should not be caught.
-
-#import("await_test_helper.dart");
-
-class E1 implements Exception {
-  const E1([msg=null]);
-}
-
-class E2 implements Exception {
-  const E2([msg=null]);
-}
-
-awaitAndCatch() {
-  try {
-    final t = await futureOf(0);
-    return t;
-  } catch (E1 e) {
-    throw const E2(); // this shouldn't execute, but currently does because
-                      // t.then() is called synchronously in the future library.
-  }
-}
-
-await_main() {
-  int t = await awaitAndCatch();
-  throw const E1();
-}
-
-main() {
-  try {
-    int t = await await_main();
-  } catch (e) {
-    Expect.isTrue(e is E1);
-  }
-}