Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/FileWriter.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 FileWriter
-interface FileWriter extends EventTarget {
-
-  /**
-   * @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent
-   */
-  FileWriterEvents get on();
-
-  static final int DONE = 2;
-
-  static final int INIT = 0;
-
-  static final int WRITING = 1;
-
-  /** @domName FileWriter.error */
-  final FileError error;
-
-  /** @domName FileWriter.length */
-  final int length;
-
-  /** @domName FileWriter.position */
-  final int position;
-
-  /** @domName FileWriter.readyState */
-  final int readyState;
-
-  /** @domName FileWriter.abort */
-  void abort();
-
-  /** @domName FileWriter.addEventListener */
-  void $dom_addEventListener(String type, EventListener listener, [bool useCapture]);
-
-  /** @domName FileWriter.dispatchEvent */
-  bool $dom_dispatchEvent(Event evt);
-
-  /** @domName FileWriter.removeEventListener */
-  void $dom_removeEventListener(String type, EventListener listener, [bool useCapture]);
-
-  /** @domName FileWriter.seek */
-  void seek(int position);
-
-  /** @domName FileWriter.truncate */
-  void truncate(int size);
-
-  /** @domName FileWriter.write */
-  void write(Blob data);
-}
-
-interface FileWriterEvents extends Events {
-
-  EventListenerList get abort();
-
-  EventListenerList get error();
-
-  EventListenerList get progress();
-
-  EventListenerList get write();
-
-  EventListenerList get writeEnd();
-
-  EventListenerList get writeStart();
-}