Converted Observatory nav-notify element

runtime/observatory/lib/src/models/objects/extension_data.dart

Index: runtime/observatory/lib/src/models/objects/extension_data.dart
diff --git a/pkg/analyzer_cli/test/data/package_with_embedder_yaml/lib/async.dart b/runtime/observatory/lib/src/models/objects/extension_data.dart
similarity index 53%
copy from pkg/analyzer_cli/test/data/package_with_embedder_yaml/lib/async.dart
copy to runtime/observatory/lib/src/models/objects/extension_data.dart
index 3b69a2a4dca3f7b1454b5127c2e71c561a8ff496..5000a9b901f106283db52056cc8bb8bc46963923 100644
--- a/pkg/analyzer_cli/test/data/package_with_embedder_yaml/lib/async.dart
+++ b/runtime/observatory/lib/src/models/objects/extension_data.dart
@@ -1,9 +1,7 @@
 // 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.
+// BSD-style license that can be found in the LICENSE file
 
-library dart.async;
+part of models;
 
-abstract class Future<T> {}
-
-abstract class Stream<T> {}
+abstract class ExtensionData implements Map<String, dynamic> {}