Change dart2js_foreign suite to use metadata.

dart/tests/compiler/dart2js_foreign/native_missing_method2_test.dart

 // Copyright (c) 2012, 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 native "*A" {
+@native("*A")
+class A  {
 }
 
-makeA() native;
+@native makeA();
 
-void setup() native """
+@native("""
 function A() {};
 A.prototype.foo = function() { return  42; }
 makeA = function() { return new A; }
-""";
+""")
+void setup();
 
 class B {
   foo() { return 42; }
 }
 
 class C {
   // By having two 'foo' defined in the application, Frog will mangle
   // all calls to 'foo', which makes this test pass.
   foo(x) { return 43; }
 }
@@ skipping 18 matching lines @@
                 (e) => e is NoSuchMethodException);
   Expect.throws(() => a.foo = 4,
                 (e) => e is NoSuchMethodException);
 }
 
 main() {
   setup();
   typedContext();
   untypedContext();
 }