Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/WorkerLocation.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 WorkerLocation
-interface WorkerLocation {
-
-  /** @domName WorkerLocation.hash */
-  final String hash;
-
-  /** @domName WorkerLocation.host */
-  final String host;
-
-  /** @domName WorkerLocation.hostname */
-  final String hostname;
-
-  /** @domName WorkerLocation.href */
-  final String href;
-
-  /** @domName WorkerLocation.pathname */
-  final String pathname;
-
-  /** @domName WorkerLocation.port */
-  final String port;
-
-  /** @domName WorkerLocation.protocol */
-  final String protocol;
-
-  /** @domName WorkerLocation.search */
-  final String search;
-
-  /** @domName WorkerLocation.toString */
-  String toString();
-}