Change dart2js_foreign suite to use metadata.

dart/tests/compiler/dart2js_foreign/native_wrapping_function2_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.
 
 typedef void Callback0();
 typedef void Callback1(arg1);
 typedef void Callback2(arg1, arg2);
 
-class A native "*A" {
-  foo0(Callback0 closure) native "return closure();";
-  foo1(Callback1 closure, arg1) native "return closure(arg1);";
-  foo2(Callback2 closure, arg1, arg2) native "return closure(arg1, arg2);";
-  foo3([Callback0 closure]) native
-      "return closure == (void 0) ? 42 : closure();";
+@native("*A")
+class A  {
+  @native("return closure();")
+  foo0(Callback0 closure);
+
+  @native("return closure(arg1);")
+  foo1(Callback1 closure, arg1);
+
+  @native("return closure(arg1, arg2);")
+  foo2(Callback2 closure, arg1, arg2);
+
+  @native("return closure == (void 0) ? 42 : closure();")
+  foo3([Callback0 closure]);
 }
 
-makeA() native;
+@native makeA();
 
-void setup() native """
+@native("""
 function A() {}
 makeA = function(){return new A;};
-""";
-
+""")
+void setup();
 
 main() {
   setup();
   var a = makeA();
   Expect.equals(42, a.foo0(() => 42));
   Expect.equals(43, a.foo1((arg1) => arg1, 43));
   Expect.equals(44, a.foo2((arg1, arg2) => arg1 + arg2, 21, 23));
   Expect.equals(42, a.foo3());
   Expect.equals(43, a.foo3(() => 43));
 
   A aa = a;
   Expect.equals(42, aa.foo0(() => 42));
   Expect.equals(43, aa.foo1((arg1) => arg1, 43));
   Expect.equals(44, aa.foo2((arg1, arg2) => arg1 + arg2, 21, 23));
   Expect.equals(42, aa.foo3());
   Expect.equals(43, aa.foo3(() => 43));
 }