Forbid arguments to functions with 'native' bodies.

tests/compiler/dart2js_native/native_property_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.
 
 // Properties on hidden native classes.
 
 class A native "*A" {
 
   // Setters and getters should be similar to these methods:
-  int getX() native 'return this._x;';
-  void setX(int value) native 'this._x = value;';
+  int getX() => JS('int', '#._x', this);
+  void setX(int value) { JS('void', '#._x = #', this, value); }
 
   int get X() native;
   set X(int value) native;
 
   int get Y() native;
   set Y(int value) native;
 
-  int get Z() native 'return this._z;';
-  set Z(int value) native 'this._z = value;';
+  int get Z => JS('int', '#._z', this);
+  set Z(int value) { JS('void', '#._z = #', this, value); }
 }
 
 A makeA() native { return new A(); }
 
 void setup() native """
 function A() {}
 
 Object.defineProperty(A.prototype, "X", {
   get: function () { return this._x; },
   set: function (v) { this._x = v; }
@@ skipping 12 matching lines @@
   Expect.equals(5, a.getX());
 
   a.X = 10;
   a.Y = 20;
   a.Z = 30;
 
   Expect.equals(10, a.X);
   Expect.equals(20, a.Y);
   Expect.equals(30, a.Z);
 }