Revert "Revert "Allow multiple tags in native clause.""

tests/compiler/dart2js_native/native_checked_fields_frog_test.dart

Index: tests/compiler/dart2js_native/native_checked_fields_frog_test.dart
diff --git a/tests/compiler/dart2js_native/native_checked_fields_frog_test.dart b/tests/compiler/dart2js_native/native_checked_fields_frog_test.dart
index a63674c441e346cb9bb9e396d481b3347c60efa2..22b9c7a1fdd8bd35bd7d7601f055fdf0ea1b0c2e 100644
--- a/tests/compiler/dart2js_native/native_checked_fields_frog_test.dart
+++ b/tests/compiler/dart2js_native/native_checked_fields_frog_test.dart
@@ -6,11 +6,11 @@ import "package:expect/expect.dart";
 
 // Test that type checks occur on assignment to fields of native methods.
 
-class A native "*A" {
+class A native "A" {
   int foo;
 }
 
-class B native "*B" {
+class B native "B" {
   String foo;
 }