Use "package:" imports for pub.

test/lish/cloud_storage_upload_provides_an_error_test.dart

 // Copyright (c) 2013, 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.
 
+import 'package:pub/src/io.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:scheduled_test/scheduled_server.dart';
 import 'package:shelf/shelf.dart' as shelf;
 
-import '../../lib/src/io.dart';
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
 
 main() {
   initConfig();
   setUp(d.validPackage.create);
 
   integration('cloud storage upload provides an error', () {
     var server = new ScheduledServer();
@@ skipping 10 matching lines @@
             headers: {'content-type': 'application/xml'});
       });
     });
 
     // TODO(nweiz): This should use the server's error message once the client
     // can parse the XML.
     pub.stderr.expect('Failed to upload the package.');
     pub.shouldExit(1);
   });
 }