Remove everything but markdown from third_party

third_party/pkg/js/lib/src/wrapping/typed_proxy.dart

Index: third_party/pkg/js/lib/src/wrapping/typed_proxy.dart
diff --git a/third_party/pkg/js/lib/src/wrapping/typed_proxy.dart b/third_party/pkg/js/lib/src/wrapping/typed_proxy.dart
deleted file mode 100644
index cca120d435a6fdcfba2402e7600a4af17e96125f..0000000000000000000000000000000000000000
--- a/third_party/pkg/js/lib/src/wrapping/typed_proxy.dart
+++ /dev/null
@@ -1,18 +0,0 @@
-// 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.
-
-part of js.wrapping;
-
-/// base class to wrap a [Proxy] in a strong typed object.
-class TypedProxy implements Serializable<Proxy> {
-  final Proxy $unsafe;
-
-  TypedProxy([Serializable<FunctionProxy> function, List args])
-      : this.fromProxy(new Proxy.withArgList(
-            function != null ? function : context.Object,
-            args != null ? args : []));
-  TypedProxy.fromProxy(this.$unsafe);
-
-  @override dynamic toJs() => $unsafe;
-}