Remove deprecated methods from ClassBuilder.

pkg/front_end/tool/_fasta/generate_messages.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:io';
 
 import 'dart:isolate';
 
 import 'package:yaml/yaml.dart' show loadYaml;
 
@@ skipping 62 matching lines @@
       case "#name":
         parameters.add("String name");
         arguments.add("'name': name");
         break;
 
       case "#name2":
         parameters.add("String name2");
         arguments.add("'name2': name2");
         break;
 
+      case "#name3":
+        parameters.add("String name3");
+        arguments.add("'name3': name3");
+        break;
+
       case "#lexeme":
         parameters.add("Token token");
         conversions.add("String lexeme = token.lexeme;");
         arguments.add("'token': token");
         break;
 
       case "#string":
         parameters.add("String string");
         arguments.add("'string': string");
         break;
@@ skipping 81 matching lines @@
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 Message _withArguments$name(${parameters.join(', ')}) {
   ${conversions.join('\n  ')}
   return new Message(
      code$name,
      ${messageArguments.join(', ')});
 }
 """;
 }