Revert "Add support for the new function-type syntax."

tests/language/generic_function_typedef_test.dart

-// Copyright (c) 2012, 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.
-// Dart test for a function type test that cannot be eliminated at compile time.
-
-import "package:expect/expect.dart";
-
-class A {
-}
-
-typedef F<T> = Function<S>(List<S> list, Function<A>(A), T);
-
-foo(List<dynamic> x, bar(String y), int z) {}
-foo2(List<int> x, bar(String y), int z) {}
-
-main() {
-  Expect.isTrue(foo is F);
-  Expect.isTrue(foo is F<int>);
-  Expect.isFalse(foo is F<bool>);
-
-  Expect.isTrue(foo2 is F);
-  Expect.isTrue(foo2 is F<int>);
-  Expect.isFalse(foo2 is F<bool>);
-}