Update parser and scanner.

pkg/dart_parser/lib/src/top_level_parser.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.
 
 library dart_parser.top_level_parser;
 
 import 'package:dart_scanner/src/token.dart' show
     Token;
 
 import 'listener.dart' show
     Listener;
 
 import 'class_member_parser.dart' show
     ClassMemberParser;
 
 /// Parser which only parses top-level elements, but ignores their bodies.
 /// Use [Parser] to parse everything.
 class TopLevelParser extends ClassMemberParser {
-  TopLevelParser(Listener listener,
-      {bool asyncAwaitKeywordsEnabled: false,
-       bool enableGenericMethodSyntax: false})
-      : super(listener, asyncAwaitKeywordsEnabled: asyncAwaitKeywordsEnabled,
-          enableGenericMethodSyntax: enableGenericMethodSyntax);
+  TopLevelParser(Listener listener, {bool asyncAwaitKeywordsEnabled: false})
+      : super(listener, asyncAwaitKeywordsEnabled: asyncAwaitKeywordsEnabled);
 
   Token parseClassBody(Token token) => skipClassBody(token);
 }