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

tests/compiler/dart2js_native/native_method_rename2_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.
 
 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;
 }
 
 makeA() native;
 makeB() native;
 
 void setup() native """
 // This code is all inside 'setup' and so not accesible from the global scope.
 function inherits(child, parent) {
   if (child.prototype.__proto__) {
     child.prototype.__proto__ = parent.prototype;
@@ skipping 47 matching lines @@
 expectNoSuchMethod(action, note) {
   bool caught = false;
   try {
     action();
   } catch (ex) {
     caught = true;
     Expect.isTrue(ex is NoSuchMethodError, note);
   }
   Expect.isTrue(caught, note);
 }