Add @JSName annotation for native fields and methods - second try.

tests/compiler/dart2js_native/native_method_rename3_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.
 
 // Test the feature where the native string declares the native method's name.
 // #3. The name does not get
 
 class A native "*A" {
-  int foo() native 'fooA';
+  @JSName('fooA')
+  int foo() native;
 }
 
 class B extends A native "*B" {
-  int foo() native 'fooB';
+  @JSName('fooB')
+  int foo() native;
   int fooA() => 333;
 }
 
 class Decoy {
   int fooA() => 666;
   int fooB() => 999;
 }
 
 makeA() native;
 makeB() native;
@@ skipping 60 matching lines @@
 expectNoSuchMethod(action, note) {
   bool caught = false;
   try {
     action();
   } on NoSuchMethodError catch (ex) {
     caught = true;
     Expect.isTrue(ex is NoSuchMethodError, note);
   }
   Expect.isTrue(caught, note);
 }