Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/NamedNodeMap.dartdoc

Index: lib/html/doc/interface/NamedNodeMap.dartdoc
diff --git a/lib/html/doc/interface/NamedNodeMap.dartdoc b/lib/html/doc/interface/NamedNodeMap.dartdoc
deleted file mode 100644
index 1652c6ab3ce21e58ae572ce504ab2b5390c178a5..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/NamedNodeMap.dartdoc
+++ /dev/null
@@ -1,35 +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 NamedNodeMap
-interface NamedNodeMap extends List<Node> {
-
-  /** @domName NamedNodeMap.length */
-  final int length;
-
-  /** @domName NamedNodeMap.getNamedItem */
-  Node getNamedItem(String name);
-
-  /** @domName NamedNodeMap.getNamedItemNS */
-  Node getNamedItemNS(String namespaceURI, String localName);
-
-  /** @domName NamedNodeMap.item */
-  Node item(int index);
-
-  /** @domName NamedNodeMap.removeNamedItem */
-  Node removeNamedItem(String name);
-
-  /** @domName NamedNodeMap.removeNamedItemNS */
-  Node removeNamedItemNS(String namespaceURI, String localName);
-
-  /** @domName NamedNodeMap.setNamedItem */
-  Node setNamedItem(Node node);
-
-  /** @domName NamedNodeMap.setNamedItemNS */
-  Node setNamedItemNS(Node node);
-}