Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/ParamElement.dartdoc

Index: lib/html/doc/interface/ParamElement.dartdoc
diff --git a/lib/html/doc/interface/ParamElement.dartdoc b/lib/html/doc/interface/ParamElement.dartdoc
deleted file mode 100644
index 69c81ad7e839c51f1cbb5e86414f19a4f8f45ac8..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/ParamElement.dartdoc
+++ /dev/null
@@ -1,25 +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 HTMLParamElement
-interface ParamElement extends Element default _Elements {
-
-  ParamElement();
-
-  /** @domName HTMLParamElement.name */
-  String name;
-
-  /** @domName HTMLParamElement.type */
-  String type;
-
-  /** @domName HTMLParamElement.value */
-  String value;
-
-  /** @domName HTMLParamElement.valueType */
-  String valueType;
-}