Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/NodeList.dartdoc

Index: lib/html/doc/interface/NodeList.dartdoc
diff --git a/lib/html/doc/interface/NodeList.dartdoc b/lib/html/doc/interface/NodeList.dartdoc
deleted file mode 100644
index 128d76567fc21162ce345ad0408636d300fa9217..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/NodeList.dartdoc
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright (c) 2011, 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 NodeList
-interface NodeList extends List<Node> {
-
-  NodeList filter(bool f(Node element));
-
-  NodeList getRange(int start, int length);
-
-  Node get first();
-
-
-  /** @domName NodeList.length */
-  final int length;
-
-}