Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/AreaElement.dartdoc

Index: lib/html/doc/interface/AreaElement.dartdoc
diff --git a/lib/html/doc/interface/AreaElement.dartdoc b/lib/html/doc/interface/AreaElement.dartdoc
deleted file mode 100644
index dcf0ad94eb910b6691cc89943868da5a19c2417f..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/AreaElement.dartdoc
+++ /dev/null
@@ -1,55 +0,0 @@
-// 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 HTMLAreaElement
-interface AreaElement extends Element default _Elements {
-
-  AreaElement();
-
-  /** @domName HTMLAreaElement.alt */
-  String alt;
-
-  /** @domName HTMLAreaElement.coords */
-  String coords;
-
-  /** @domName HTMLAreaElement.hash */
-  final String hash;
-
-  /** @domName HTMLAreaElement.host */
-  final String host;
-
-  /** @domName HTMLAreaElement.hostname */
-  final String hostname;
-
-  /** @domName HTMLAreaElement.href */
-  String href;
-
-  /** @domName HTMLAreaElement.noHref */
-  bool noHref;
-
-  /** @domName HTMLAreaElement.pathname */
-  final String pathname;
-
-  /** @domName HTMLAreaElement.ping */
-  String ping;
-
-  /** @domName HTMLAreaElement.port */
-  final String port;
-
-  /** @domName HTMLAreaElement.protocol */
-  final String protocol;
-
-  /** @domName HTMLAreaElement.search */
-  final String search;
-
-  /** @domName HTMLAreaElement.shape */
-  String shape;
-
-  /** @domName HTMLAreaElement.target */
-  String target;
-}