Change dart2js_foreign suite to use metadata.

dart/tests/compiler/dart2js_foreign/native_checked_fields_test.dart

Index: dart/tests/compiler/dart2js_foreign/native_checked_fields_test.dart
diff --git a/dart/tests/compiler/dart2js_foreign/native_checked_fields_test.dart b/dart/tests/compiler/dart2js_foreign/native_checked_fields_test.dart
index df3421a0359513095fa3337765d4452905c00300..1d72f106c42e5f05b5a0b22b9ae854d0a25f7456 100644
--- a/dart/tests/compiler/dart2js_foreign/native_checked_fields_test.dart
+++ b/dart/tests/compiler/dart2js_foreign/native_checked_fields_test.dart
@@ -4,25 +4,28 @@
 
 // Test that type checks occur on assignment to fields of native methods.
 
-class A native "*A" {
+@native("*A")
+class A  {
   int foo;
 }
 
-class B native "*B" {
+@native("*B")
+class B  {
   String foo;
 }
 
-A makeA() native { return new A(); }
-B makeB() native { return new B(); }
+@native A makeA() { return new A(); }
+@native B makeB() { return new B(); }
 
-void setup() native """
+@native("""
 function A() {}
 
 function B() {}
 
 makeA = function(){return new A;};
 makeB = function(){return new B;};
-""";
+""")
+void setup();
 
 expectThrows(action()) {
   bool threw = false;