Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/MediaKeyError.dartdoc

Index: lib/html/doc/interface/MediaKeyError.dartdoc
diff --git a/lib/html/doc/interface/MediaKeyError.dartdoc b/lib/html/doc/interface/MediaKeyError.dartdoc
deleted file mode 100644
index d25cda9f97d1cedb74b6b286f20ef185931f38f9..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/MediaKeyError.dartdoc
+++ /dev/null
@@ -1,26 +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 MediaKeyError
-interface MediaKeyError {
-
-  static final int MEDIA_KEYERR_CLIENT = 2;
-
-  static final int MEDIA_KEYERR_DOMAIN = 6;
-
-  static final int MEDIA_KEYERR_HARDWARECHANGE = 5;
-
-  static final int MEDIA_KEYERR_OUTPUT = 4;
-
-  static final int MEDIA_KEYERR_SERVICE = 3;
-
-  static final int MEDIA_KEYERR_UNKNOWN = 1;
-
-  /** @domName MediaKeyError.code */
-  final int code;
-}