Use "package:" imports for pub.

test/lish/many_files_test.dart

 // Copyright (c) 2015, 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 'dart:convert';
 import 'dart:io';
 import 'dart:math' as math;
 
 import 'package:path/path.dart' as p;
+import 'package:pub/src/exit_codes.dart' as exit_codes;
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:scheduled_test/scheduled_server.dart';
 import 'package:shelf/shelf.dart' as shelf;
 
-import '../../lib/src/exit_codes.dart' as exit_codes;
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
 
 /// The maximum number of bytes in an entire path.
 ///
 /// This is [Windows's number][MAX_PATH], which is a much tighter constraint
 /// than OS X or Linux. We subtract one because Windows counts it as the number
 /// of bytes in a path C string including the terminating NUL but we only count
 /// characters here.
@@ skipping 64 matching lines @@
       return new shelf.Response.ok(JSON.encode({
         'success': {'message': 'Package test_pkg 1.0.0 uploaded!'}
       }));
     });
 
     pub.stdout.expect(startsWith('Uploading...'));
     pub.stdout.expect('Package test_pkg 1.0.0 uploaded!');
     pub.shouldExit(exit_codes.SUCCESS);
   });
 }