Remove files that have already been ported or do not need to be ported.

client/html/src/Notification.dart

Index: client/html/src/Notification.dart
diff --git a/client/html/src/Notification.dart b/client/html/src/Notification.dart
deleted file mode 100644
index 014161c52853f35125c01f34d591928cf95b690f..0000000000000000000000000000000000000000
--- a/client/html/src/Notification.dart
+++ /dev/null
@@ -1,34 +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.
-
-interface Notification extends EventTarget {
-
-  String get dir();
-
-  void set dir(String value);
-
-  EventListener get onclick();
-
-  void set onclick(EventListener value);
-
-  EventListener get onclose();
-
-  void set onclose(EventListener value);
-
-  EventListener get ondisplay();
-
-  void set ondisplay(EventListener value);
-
-  EventListener get onerror();
-
-  void set onerror(EventListener value);
-
-  String get replaceId();
-
-  void set replaceId(String value);
-
-  void cancel();
-
-  void show();
-}