Use message.yaml in parser.

pkg/front_end/lib/src/fasta/source/diet_parser.dart

Index: pkg/front_end/lib/src/fasta/source/diet_parser.dart
diff --git a/pkg/front_end/lib/src/fasta/source/diet_parser.dart b/pkg/front_end/lib/src/fasta/source/diet_parser.dart
index 82251320e134808dd493a41be37673ad3c933444..db223372a0412b9c7b1f7714dd42d751eb94e8ba 100644
--- a/pkg/front_end/lib/src/fasta/source/diet_parser.dart
+++ b/pkg/front_end/lib/src/fasta/source/diet_parser.dart
@@ -4,16 +4,16 @@
 
 library fasta.diet_parser;
 
-import '../scanner/token.dart' show BeginGroupToken, Token;
+import '../fasta_codes.dart' show codeExpectedOpenParens;
 
 import '../parser/class_member_parser.dart' show ClassMemberParser;
 
-import '../parser/error_kind.dart' show ErrorKind;
-
 import '../parser/listener.dart' show Listener;
 
 import '../parser/parser.dart' show optional;
 
+import '../scanner/token.dart' show BeginGroupToken, Token;
+
 // TODO(ahe): Move this to parser package.
 class DietParser extends ClassMemberParser {
   DietParser(Listener listener) : super(listener);
@@ -26,10 +26,10 @@ class DietParser extends ClassMemberParser {
     listener.beginOptionalFormalParameters(token);
     if (!optional('(', token)) {
       if (optional(';', token)) {
-        reportRecoverableError(token, ErrorKind.ExpectedOpenParens, {});
+        reportRecoverableErrorCode(token, codeExpectedOpenParens);
         return token;
       }
-      return reportUnrecoverableError(token, ErrorKind.UnexpectedToken)?.next;
+      return reportUnexpectedToken(token).next;
     }
     BeginGroupToken beginGroupToken = token;
     Token endToken = beginGroupToken.endGroup;