Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/Point.dartdoc

Index: lib/html/doc/interface/Point.dartdoc
diff --git a/lib/html/doc/interface/Point.dartdoc b/lib/html/doc/interface/Point.dartdoc
deleted file mode 100644
index b403a29be8109bc46d1fe0c984f275b84e3f286a..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/Point.dartdoc
+++ /dev/null
@@ -1,19 +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 WebKitPoint
-interface Point default _PointFactoryProvider {
-
-  Point(num x, num y);
-
-  /** @domName WebKitPoint.x */
-  num x;
-
-  /** @domName WebKitPoint.y */
-  num y;
-}