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

tests/language/generic_function_typedef2_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 int F();
-
-typedef G = F; /// 00: compile-time error
-typedef H = int; /// 01: compile-time error
-typedef I = A; /// 02: compile-time error
-typedef J = List<int>; /// 03: compile-time error
-typedef K = Function(Function<A>(A
-    <int>  /// 04: static type warning
-    ));
-typedef L = Function({
-  /*   /// 05: compile-time error
-  bool
-  */   /// 05: compile-time error
-  x});
-
-typedef M = Function({
-  /*   /// 06: compile-time error
-  bool
-  */   /// 06: compile-time error
-  int});
-
-foo({bool int}) {}
-main() {
-  bool b = true;
-  Expect.isFalse(b is G);  /// 00: continued
-  Expect.isFalse(b is H);  /// 01: continued
-  Expect.isFalse(b is I);  /// 02: continued
-  Expect.isFalse(b is J);  /// 03: continued
-  Expect.isFalse(b is K);  /// 04: continued
-  Expect.isFalse(b is L);
-  Expect.isFalse(b is M);
-  Expect.isTrue(foo is M);
-}