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

frog/tests/frog_native/native_class_with_dart_methods_frog_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.
-
-// Additional Dart code may be 'placed on' hidden native classes.
-
-class A native "*A" {
-
-  var _field;
-
-  int get X() => _field;
-  void set X(int x) { _field = x; }
-
-  int method(int z) => _field + z;
-}
-
-A makeA() native { return new A(); }
-
-void setup() native """
-function A() {}
-makeA = function(){return new A;};
-""";
-
-
-main() {
-  setup();
-
-  var a = makeA();
-
-  a.X = 100;
-  Expect.equals(100, a.X);
-  Expect.equals(150, a.method(50));
-}