Unused import

Author: justinmc

script/tool/lib/src/test_dart_fixes_command.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:io';
 
 import 'package:file/file.dart';
 import 'package:meta/meta.dart';