Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/StyleSheet.dartdoc

Index: lib/html/doc/interface/StyleSheet.dartdoc
diff --git a/lib/html/doc/interface/StyleSheet.dartdoc b/lib/html/doc/interface/StyleSheet.dartdoc
deleted file mode 100644
index 06133e542ea308fd03f028446262bd3641fbfbd3..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/StyleSheet.dartdoc
+++ /dev/null
@@ -1,32 +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 StyleSheet
-interface StyleSheet {
-
-  /** @domName StyleSheet.disabled */
-  bool disabled;
-
-  /** @domName StyleSheet.href */
-  final String href;
-
-  /** @domName StyleSheet.media */
-  final MediaList media;
-
-  /** @domName StyleSheet.ownerNode */
-  final Node ownerNode;
-
-  /** @domName StyleSheet.parentStyleSheet */
-  final StyleSheet parentStyleSheet;
-
-  /** @domName StyleSheet.title */
-  final String title;
-
-  /** @domName StyleSheet.type */
-  final String type;
-}