Use "package:" imports for pub.

test/get/path/relative_path_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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 d.file.
 
 import 'package:path/path.dart' as path;
+import 'package:pub/src/lock_file.dart';
+import 'package:pub/src/source_registry.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:unittest/unittest.dart';
 
-import '../../../lib/src/lock_file.dart';
-import '../../../lib/src/source_registry.dart';
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration("can use relative path", () {
     d.dir("foo", [
       d.libDir("foo"),
       d.libPubspec("foo", "0.0.1")
     ]).create();
@@ skipping 61 matching lines @@
 
     schedule(() {
       var lockfilePath = path.join(sandboxDir, appPath, "pubspec.lock");
       var lockfile = new LockFile.load(lockfilePath, new SourceRegistry());
       var description = lockfile.packages["foo"].description;
 
       expect(path.isRelative(description["path"]), isTrue);
     });
   });
 }