support class native clause

pkg/front_end/lib/src/fasta/fasta_codes_generated.dart

Index: pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
diff --git a/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart b/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
index 7227a48f0edb78c8729d6c090f6a0facaf8c58bb..4e5648571408615e13efa8f9811505c1e924298d 100644
--- a/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
+++ b/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
@@ -1912,6 +1912,19 @@ const MessageCode messageNamedFunctionExpression = const MessageCode(
     dart2jsCode: "*ignored*",
     message: r"""A function expression can't have a name.""");
 
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Code<Null> codeNativeClauseShouldBeAnnotation =
+    messageNativeClauseShouldBeAnnotation;
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const MessageCode messageNativeClauseShouldBeAnnotation = const MessageCode(
+    "NativeClauseShouldBeAnnotation",
+    analyzerCode: "NATIVE_CLAUSE_SHOULD_BE_ANNOTATION",
+    dart2jsCode: "*fatal*",
+    message: r"""Native clause in this form is deprecated.""",
+    tip:
+        r"""Try removing this native clause and adding @native() or @native('some-text-here') before the declaration.""");
+
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const Template<
     Message Function(Token token)> templateNoFormals = const Template<