Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/TextTrackCue.dartdoc

-// 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 TextTrackCue
-interface TextTrackCue extends EventTarget default _TextTrackCueFactoryProvider {
-
-  TextTrackCue(String id, num startTime, num endTime, String text, [String settings, bool pauseOnExit]);
-
-  /**
-   * @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent
-   */
-  TextTrackCueEvents get on();
-
-  /** @domName TextTrackCue.align */
-  String align;
-
-  /** @domName TextTrackCue.endTime */
-  num endTime;
-
-  /** @domName TextTrackCue.id */
-  String id;
-
-  /** @domName TextTrackCue.line */
-  int line;
-
-  /** @domName TextTrackCue.pauseOnExit */
-  bool pauseOnExit;
-
-  /** @domName TextTrackCue.position */
-  int position;
-
-  /** @domName TextTrackCue.size */
-  int size;
-
-  /** @domName TextTrackCue.snapToLines */
-  bool snapToLines;
-
-  /** @domName TextTrackCue.startTime */
-  num startTime;
-
-  /** @domName TextTrackCue.text */
-  String text;
-
-  /** @domName TextTrackCue.track */
-  final TextTrack track;
-
-  /** @domName TextTrackCue.vertical */
-  String vertical;
-
-  /** @domName TextTrackCue.addEventListener */
-  void $dom_addEventListener(String type, EventListener listener, [bool useCapture]);
-
-  /** @domName TextTrackCue.dispatchEvent */
-  bool $dom_dispatchEvent(Event evt);
-
-  /** @domName TextTrackCue.getCueAsHTML */
-  DocumentFragment getCueAsHTML();
-
-  /** @domName TextTrackCue.removeEventListener */
-  void $dom_removeEventListener(String type, EventListener listener, [bool useCapture]);
-}
-
-interface TextTrackCueEvents extends Events {
-
-  EventListenerList get enter();
-
-  EventListenerList get exit();
-}