Split parser/listener.dart, parser/class_element_listener.dart and tokens/token.dart into smaller l…

tests/compiler/dart2js/backend_dart/dart_printer_test.dart

Index: tests/compiler/dart2js/backend_dart/dart_printer_test.dart
diff --git a/tests/compiler/dart2js/backend_dart/dart_printer_test.dart b/tests/compiler/dart2js/backend_dart/dart_printer_test.dart
index f581497a586fcbc34c3859410e33981172e97c00..801b75d1063d1f11d77c7ec2a556ec01cb067548 100644
--- a/tests/compiler/dart2js/backend_dart/dart_printer_test.dart
+++ b/tests/compiler/dart2js/backend_dart/dart_printer_test.dart
@@ -17,6 +17,7 @@ import 'package:compiler/src/parser/listener.dart';
 import 'package:compiler/src/parser/parser.dart';
 import 'package:compiler/src/scanner/scanner.dart';
 import 'package:compiler/src/tokens/token.dart';
+import 'package:compiler/src/tokens/token_constants.dart';
 import 'package:compiler/src/io/source_file.dart';
 import 'package:compiler/src/string_validator.dart';
 import 'package:compiler/src/tree/tree.dart' show DartString;