Update dart2js_foreign suite as we now validate annotations.

dart/tests/compiler/dart2js_foreign/native_property_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.
 
-@native("*A")
+import 'native_metadata.dart';
+
+@Native("*A")
 class A {
 
   // Setters and getters should be similar to these methods:
-  @native('return this._x;')
+  @Native('return this._x;')
   int getX();
 
-  @native('this._x = value;')
+  @Native('this._x = value;')
   void setX(int value);
 
   @native
   int get X;
 
   @native
   set X(int value);
 
   @native
   int get Y;
 
   @native
   set Y(int value);
 
-  @native('return this._z;')
+  @Native('return this._z;')
   int get Z;
 
-  @native('this._z = value;')
+  @Native('this._z = value;')
   set Z(int value);
 }
 
 @native
 A makeA() { return new A(); }
 
-@native("""
+@Native("""
 function A() {}
 
 Object.defineProperty(A.prototype, "X", {
   get: function () { return this._x; },
   set: function (v) { this._x = v; }
 });
 
 makeA = function(){return new A;};
 """)
 void setup();
 
 
 main() {
   setup();
 
   var a = makeA();
 
   a.setX(5);
   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);
 }