Remove wrong type annotation.

utils/tests/pub/test_pub.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Test infrastructure for testing pub. Unlike typical unit tests, most pub
  * tests are integration tests that stage some stuff on the file system, run
  * pub, and then validate the results. This library provides an API to build
  * tests like that.
  */
@@ skipping 1021 matching lines @@
   }
 
   /// Schedule a Git command to run in this repository.
   void scheduleGit(List<String> args) {
     _schedule((parentDir) {
       var gitDir = new Directory(join(parentDir, name));
       return _runGit(args, gitDir);
     });
   }
 
-  Future _runGitCommands(String parentDir, List<List<String>> commands) {
+  Future _runGitCommands(parentDir, List<List<String>> commands) {
     var workingDir;
 
     Future runGitStep(_) {
       if (commands.isEmpty) return new Future.immediate(workingDir);
       var command = commands.removeAt(0);
       return _runGit(command, workingDir).chain(runGitStep);
     }
 
     return super.create(parentDir).chain((rootDir) {
       workingDir = rootDir;
@@ skipping 162 matching lines @@
 }
 
 /**
  * Schedules a callback to be called after Pub is run with [runPub], even if it
  * fails.
  */
 void _scheduleCleanup(_ScheduledEvent event) {
   if (_scheduledCleanup == null) _scheduledCleanup = [];
   _scheduledCleanup.add(event);
 }