Remove analyzer workaround for #27447.

pkg/analyzer/test/generated/utilities_dart_test.dart

 // Copyright (c) 2016, 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.
 
 library analyzer.test.generated.utilities_dart_test;
 
 import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
@@ skipping 20 matching lines @@
     _validate('package:a/b.dart', 'c.dart', 'package:a/c.dart');
     _validate('package:a/b/c.dart', 'd.dart', 'package:a/b/d.dart');
     _validate('package:a/b/c.dart', '../d.dart', 'package:a/d.dart');
   }
 
   void test_relative_relative() {
     _validate('a/b.dart', 'c.dart', 'a/c.dart');
     _validate('a/b.dart', '../c.dart', 'c.dart');
     _validate('a.dart', '../b.dart', '../b.dart');
     _validate('a.dart', '../../b.dart', '../../b.dart');
-    // TODO(scheglov) After https://github.com/dart-lang/sdk/issues/27447
-    // TODO(scheglov) include also this, currently failing test.
-//    _validate('a/b.dart', '../../c.dart', '../c.dart');
+    _validate('a/b.dart', '../../c.dart', '../c.dart');
   }
 
   void _validate(String base, String contained, String expected) {
     Uri actual = resolveRelativeUri(Uri.parse(base), Uri.parse(contained));
     expect(actual.toString(), expected);
   }
 }