Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/RangeException.dartdoc

Index: lib/html/doc/interface/RangeException.dartdoc
diff --git a/lib/html/doc/interface/RangeException.dartdoc b/lib/html/doc/interface/RangeException.dartdoc
deleted file mode 100644
index a0d1b09460cab614e614e75688b5f5d35793a435..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/RangeException.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 RangeException
-interface RangeException {
-
-  static final int BAD_BOUNDARYPOINTS_ERR = 1;
-
-  static final int INVALID_NODE_TYPE_ERR = 2;
-
-  /** @domName RangeException.code */
-  final int code;
-
-  /** @domName RangeException.message */
-  final String message;
-
-  /** @domName RangeException.name */
-  final String name;
-
-  /** @domName RangeException.toString */
-  String toString();
-}