Remove unused imports in pub.

sdk/lib/_internal/pub/test/dev_dependency_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:path/path.dart' as path;
-
 import 'descriptor.dart' as d;
 import 'test_pub.dart';
 
 main() {
   initConfig();
   integration("includes root package's dev dependencies", () {
     d.dir('foo', [
       d.libDir('foo'),
       d.libPubspec('foo', '0.0.1')
     ]).create();
@@ skipping 85 matching lines @@
     pubInstall();
 
     d.dir(packagesPath, [
       d.dir("foo", [
         d.file("foo.dart", 'main() => "foo";')
       ]),
       d.nothing("bar")
     ]).validate();
   });
 }