Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/XSLTProcessor.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 XSLTProcessor
-interface XSLTProcessor default _XSLTProcessorFactoryProvider {
-
-  XSLTProcessor();
-
-  /** @domName XSLTProcessor.clearParameters */
-  void clearParameters();
-
-  /** @domName XSLTProcessor.getParameter */
-  String getParameter(String namespaceURI, String localName);
-
-  /** @domName XSLTProcessor.importStylesheet */
-  void importStylesheet(Node stylesheet);
-
-  /** @domName XSLTProcessor.removeParameter */
-  void removeParameter(String namespaceURI, String localName);
-
-  /** @domName XSLTProcessor.reset */
-  void reset();
-
-  /** @domName XSLTProcessor.setParameter */
-  void setParameter(String namespaceURI, String localName, String value);
-
-  /** @domName XSLTProcessor.transformToDocument */
-  Document transformToDocument(Node source);
-
-  /** @domName XSLTProcessor.transformToFragment */
-  DocumentFragment transformToFragment(Node source, Document docVal);
-}