Move skip methods to parser base class.

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
-    BeginGroupToken,
     Token;
 
-import 'package:dart_scanner/src/characters.dart' show
-    $CLOSE_CURLY_BRACKET;
-
 import 'listener.dart' show
     Listener;
 
 import 'class_member_parser.dart' show
     ClassMemberParser;
 
-import 'parser.dart' show
-    optional;
-
 /// 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);
 
-  Token parseClassBody(Token token) {
-    if (!optional('{', token)) {
-      return listener.expectedClassBodyToSkip(token);
-    }
-    BeginGroupToken beginGroupToken = token;
-    Token endGroup = beginGroupToken.endGroup;
-    if (endGroup == null) {
-      return listener.unmatched(beginGroupToken);
-    } else if (!identical(endGroup.kind, $CLOSE_CURLY_BRACKET)) {
-      return listener.unmatched(beginGroupToken);
-    }
-    return endGroup;
-  }
+  Token parseClassBody(Token token) => skipClassBody(token);
 }