Move frog/tests/{leg,leg_only,frog_native} to tests/compiler/.

frog/tests/leg_only/closure6_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.
-
-class A {
-  var foo;
-  bar() => foo(3, 99);
-  gee(f) => foo(fun: f);
-
-  get foo2() => foo;
-  bar2() => foo2(3, 99);
-  gee2(f) => foo2(fun: f);
-}
-
-main() {
-  var a = new A();
-  a.foo = () => 499;
-  Expect.equals(499, a.foo());
-  a.foo = (x, y) => x + y;
-  Expect.equals(102, a.bar());
-  a.foo = ([fun = null]) => fun(41);
-  Expect.equals(42, a.gee((x) => x + 1));
-
-  a.foo = () => 499;
-  Expect.equals(499, a.foo2());
-  a.foo = (x, y) => x + y;
-  Expect.equals(102, a.bar2());
-  a.foo = ([fun = null]) => fun(41);
-  Expect.equals(42, a.gee2((x) => x + 1));
-}