Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/Screen.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 Screen
-interface Screen {
-
-  /** @domName Screen.availHeight */
-  final int availHeight;
-
-  /** @domName Screen.availLeft */
-  final int availLeft;
-
-  /** @domName Screen.availTop */
-  final int availTop;
-
-  /** @domName Screen.availWidth */
-  final int availWidth;
-
-  /** @domName Screen.colorDepth */
-  final int colorDepth;
-
-  /** @domName Screen.height */
-  final int height;
-
-  /** @domName Screen.pixelDepth */
-  final int pixelDepth;
-
-  /** @domName Screen.width */
-  final int width;
-}