fix scriptTag scanner_round_trip test

pkg/front_end/test/scanner_roundtrip_test.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 'package:analyzer/src/fasta/token_utils.dart';
 import 'package:front_end/src/scanner/errors.dart' as analyzer;
 import 'package:front_end/src/scanner/reader.dart' as analyzer;
 import 'package:front_end/src/scanner/scanner.dart' as analyzer;
 import 'package:front_end/src/scanner/token.dart';
 import 'package:test/test.dart';
@@ skipping 56 matching lines @@
   }
 
   @override
   @failingTest
   void test_comment_generic_method_type_list() {
     // TODO(paulberry,ahe): Fasta scanner doesn't support generic comment
     // syntax.
     super.test_comment_generic_method_type_list();
   }
 
-  @override
-  @failingTest
-  void test_scriptTag_withArgs() {
-    // TODO(paulberry,ahe): Fasta scanner doesn't support script tag
-    super.test_scriptTag_withArgs();
-  }
-
-  @override
-  @failingTest
-  void test_scriptTag_withoutSpace() {
-    // TODO(paulberry,ahe): Fasta scanner doesn't support script tag
-    super.test_scriptTag_withoutSpace();
-  }
-
-  @override
-  @failingTest
-  void test_scriptTag_withSpace() {
-    // TODO(paulberry,ahe): Fasta scanner doesn't support script tag
-    super.test_scriptTag_withSpace();
-  }
-
   void test_pseudo_keywords() {
     var pseudoAnalyzerKeywords = new Set<Keyword>.from([
       Keyword.ABSTRACT,
       Keyword.AS,
       Keyword.COVARIANT,
       Keyword.DEFERRED,
       Keyword.DYNAMIC,
       Keyword.EXPORT,
       Keyword.EXTERNAL,
       Keyword.FACTORY,
@@ skipping 17 matching lines @@
 class TestScanner extends analyzer.Scanner {
   TestScanner(analyzer.CharacterReader reader) : super(reader);
 
   @override
   void reportError(
       analyzer.ScannerErrorCode errorCode, int offset, List<Object> arguments) {
     fail('Unexpected error $errorCode while scanning offset $offset\n'
         '   arguments: $arguments');
   }
 }