Update parser so tests pass.

pkg/dart_parser/bin/parser.dart

Index: pkg/dart_parser/bin/parser.dart
diff --git a/pkg/dart_parser/bin/parser.dart b/pkg/dart_parser/bin/parser.dart
index c9c50568bc8718d4999fd7cf9fd038ecac0f73e5..f3e3a62888d1dfbe7f2d9d2161532aaf5b7a8fd7 100644
--- a/pkg/dart_parser/bin/parser.dart
+++ b/pkg/dart_parser/bin/parser.dart
@@ -2,6 +2,6 @@
 // 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:parser/src/main.dart' as parser;
+import 'package:dart_parser/src/main.dart' as dart_parser;
 
-main(List<String> arguments) => parser.main(arguments);
+main(List<String> arguments) => dart_parser.main(arguments);