Merge pull request dart-lang/source_maps#14 from srawlins/fix-unused-import

Fix unused import

pkgs/source_maps/test/run.dart

diff --git a/pkgs/source_maps/test/run.dart b/pkgs/source_maps/test/run.dart
index b37fdcd..477da8a 100755
--- a/pkgs/source_maps/test/run.dart
+++ b/pkgs/source_maps/test/run.dart
@@ -7,7 +7,6 @@
 
 import 'package:test/compact_vm_config.dart';
 import 'package:test/test.dart';
-import 'dart:io' show Options;
 
 import 'builder_test.dart' as builder_test;
 import 'end2end_test.dart' as end2end_test;