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

frog/tests/leg_only/getter_element_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.
-
-class A {
-  static main() {
-    testOther();
-    new A().testSelf();
-  }
-
-  static testOther() {
-    var o = new A();
-    o.instf = 0;
-    o.instf += 1;
-    Expect.equals(1, o.instf);
-  }
-
-  testSelf() {
-    instf = 0;
-    instf += 1;
-    Expect.equals(1, instf);
-  }
-
-  var instf;
-}
-
-main() {
-  A.main();
-}