Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/XPathException.dartdoc

Index: lib/html/doc/interface/XPathException.dartdoc
diff --git a/lib/html/doc/interface/XPathException.dartdoc b/lib/html/doc/interface/XPathException.dartdoc
deleted file mode 100644
index 4ee9b7b9a18fa1412701553a072682dc4f4e0e57..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/XPathException.dartdoc
+++ /dev/null
@@ -1,27 +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 XPathException
-interface XPathException {
-
-  static final int INVALID_EXPRESSION_ERR = 51;
-
-  static final int TYPE_ERR = 52;
-
-  /** @domName XPathException.code */
-  final int code;
-
-  /** @domName XPathException.message */
-  final String message;
-
-  /** @domName XPathException.name */
-  final String name;
-
-  /** @domName XPathException.toString */
-  String toString();
-}