Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/Notification.dartdoc

Index: lib/html/doc/interface/Notification.dartdoc
diff --git a/lib/html/doc/interface/Notification.dartdoc b/lib/html/doc/interface/Notification.dartdoc
deleted file mode 100644
index b8b08b5ba1123f40a8653b947ab914665a80cf73..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/Notification.dartdoc
+++ /dev/null
@@ -1,58 +0,0 @@
-// Copyright (c) 2012, 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.
-
-// WARNING:
-//   This file contains documentation that is merged into the real source.
-//   Do not make code changes here.
-
-/// @domName Notification
-interface Notification extends EventTarget default _NotificationFactoryProvider {
-
-  Notification(String title, [Map options]);
-
-  /**
-   * @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent
-   */
-  NotificationEvents get on();
-
-  /** @domName Notification.dir */
-  String dir;
-
-  /** @domName Notification.replaceId */
-  String replaceId;
-
-  /** @domName Notification.tag */
-  String tag;
-
-  /** @domName Notification.addEventListener */
-  void $dom_addEventListener(String type, EventListener listener, [bool useCapture]);
-
-  /** @domName Notification.cancel */
-  void cancel();
-
-  /** @domName Notification.close */
-  void close();
-
-  /** @domName Notification.dispatchEvent */
-  bool $dom_dispatchEvent(Event evt);
-
-  /** @domName Notification.removeEventListener */
-  void $dom_removeEventListener(String type, EventListener listener, [bool useCapture]);
-
-  /** @domName Notification.show */
-  void show();
-}
-
-interface NotificationEvents extends Events {
-
-  EventListenerList get click();
-
-  EventListenerList get close();
-
-  EventListenerList get display();
-
-  EventListenerList get error();
-
-  EventListenerList get show();
-}