Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/TimeRanges.dartdoc

Index: lib/html/doc/interface/TimeRanges.dartdoc
diff --git a/lib/html/doc/interface/TimeRanges.dartdoc b/lib/html/doc/interface/TimeRanges.dartdoc
deleted file mode 100644
index 349110f56880182ef4a5ecfc301fda2208d07bfe..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/TimeRanges.dartdoc
+++ /dev/null
@@ -1,20 +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 TimeRanges
-interface TimeRanges {
-
-  /** @domName TimeRanges.length */
-  final int length;
-
-  /** @domName TimeRanges.end */
-  num end(int index);
-
-  /** @domName TimeRanges.start */
-  num start(int index);
-}