Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/CSSRule.dartdoc

Index: lib/html/doc/interface/CSSRule.dartdoc
diff --git a/lib/html/doc/interface/CSSRule.dartdoc b/lib/html/doc/interface/CSSRule.dartdoc
deleted file mode 100644
index 8cf6e06e667da1f6f9336e360dcce7a720e2772c..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/CSSRule.dartdoc
+++ /dev/null
@@ -1,41 +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 CSSRule
-interface CSSRule {
-
-  static final int CHARSET_RULE = 2;
-
-  static final int FONT_FACE_RULE = 5;
-
-  static final int IMPORT_RULE = 3;
-
-  static final int MEDIA_RULE = 4;
-
-  static final int PAGE_RULE = 6;
-
-  static final int STYLE_RULE = 1;
-
-  static final int UNKNOWN_RULE = 0;
-
-  static final int WEBKIT_KEYFRAMES_RULE = 7;
-
-  static final int WEBKIT_KEYFRAME_RULE = 8;
-
-  /** @domName CSSRule.cssText */
-  String cssText;
-
-  /** @domName CSSRule.parentRule */
-  final CSSRule parentRule;
-
-  /** @domName CSSRule.parentStyleSheet */
-  final CSSStyleSheet parentStyleSheet;
-
-  /** @domName CSSRule.type */
-  final int type;
-}