Support new getter syntax.

dart/tests/compiler/dart2js_native/native_class_inheritance4_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.  With
 // inheritance, the superclass method must not be reached by a call on the
 // subclass.
 
 class A native "*A" {
   var _field;
 
-  int get X() => _field;
+  int get X => _field;
   void set X(int x) { _field = x; }
 
   int method(int z) => _field + z;
 }
 
 class B extends A native "*B" {
   var _field2;
 
-  int get X() => _field2;
+  int get X => _field2;
   void set X(int x) { _field2 = x; }
 
   int method(int z) => _field2 + z;
 }
 
 A makeA() native { return new A(); }
 B makeB() native { return new B(); }
 
 void setup() native @"""
 function inherits(child, parent) {
@@ skipping 104 matching lines @@
 }
 
 main() {
   testBasicA_dynamic();
   testBasicA_typed();
   testBasicB_dynamic();
   testBasicB_typed();
   testAB_dynamic();
   testAB_typed();
 }