Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/FileReader.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 FileReader
-interface FileReader extends EventTarget default _FileReaderFactoryProvider {
-
-  FileReader();
-
-  /**
-   * @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent
-   */
-  FileReaderEvents get on();
-
-  static final int DONE = 2;
-
-  static final int EMPTY = 0;
-
-  static final int LOADING = 1;
-
-  /** @domName FileReader.error */
-  final FileError error;
-
-  /** @domName FileReader.readyState */
-  final int readyState;
-
-  /** @domName FileReader.result */
-  final Object result;
-
-  /** @domName FileReader.abort */
-  void abort();
-
-  /** @domName FileReader.addEventListener */
-  void $dom_addEventListener(String type, EventListener listener, [bool useCapture]);
-
-  /** @domName FileReader.dispatchEvent */
-  bool $dom_dispatchEvent(Event evt);
-
-  /** @domName FileReader.readAsArrayBuffer */
-  void readAsArrayBuffer(Blob blob);
-
-  /** @domName FileReader.readAsBinaryString */
-  void readAsBinaryString(Blob blob);
-
-  /** @domName FileReader.readAsDataURL */
-  void readAsDataURL(Blob blob);
-
-  /** @domName FileReader.readAsText */
-  void readAsText(Blob blob, [String encoding]);
-
-  /** @domName FileReader.removeEventListener */
-  void $dom_removeEventListener(String type, EventListener listener, [bool useCapture]);
-}
-
-interface FileReaderEvents extends Events {
-
-  EventListenerList get abort();
-
-  EventListenerList get error();
-
-  EventListenerList get load();
-
-  EventListenerList get loadEnd();
-
-  EventListenerList get loadStart();
-
-  EventListenerList get progress();
-}