Remove last 'extra_snippet'

client/dom/snippets/events/EventTargetImpl.dart.snippet

Index: client/dom/snippets/events/EventTargetImpl.dart.snippet
diff --git a/client/dom/snippets/events/EventTargetImpl.dart.snippet b/client/dom/snippets/events/EventTargetImpl.dart.snippet
deleted file mode 100644
index 33ccc6c949afa983755abebf3e8b2fa90fad08e8..0000000000000000000000000000000000000000
--- a/client/dom/snippets/events/EventTargetImpl.dart.snippet
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright (c) 2011, 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.
-
-// TODO(vsm): Should we add this to the API?  Dart doesn't support
-// overloading, so we'd need to do this differently.
-// void addEventListener(String type, EventListener listener) {
-//   addEventListener(type, listener, false);
-// }