Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/SVGPathSegCurvetoCubicRel.dartdoc

Index: lib/html/doc/interface/SVGPathSegCurvetoCubicRel.dartdoc
diff --git a/lib/html/doc/interface/SVGPathSegCurvetoCubicRel.dartdoc b/lib/html/doc/interface/SVGPathSegCurvetoCubicRel.dartdoc
deleted file mode 100644
index 4812a8e16df944fe1aa08b16f65445eb7b515ce0..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/SVGPathSegCurvetoCubicRel.dartdoc
+++ /dev/null
@@ -1,29 +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 SVGPathSegCurvetoCubicRel
-interface SVGPathSegCurvetoCubicRel extends SVGPathSeg {
-
-  /** @domName SVGPathSegCurvetoCubicRel.x */
-  num x;
-
-  /** @domName SVGPathSegCurvetoCubicRel.x1 */
-  num x1;
-
-  /** @domName SVGPathSegCurvetoCubicRel.x2 */
-  num x2;
-
-  /** @domName SVGPathSegCurvetoCubicRel.y */
-  num y;
-
-  /** @domName SVGPathSegCurvetoCubicRel.y1 */
-  num y1;
-
-  /** @domName SVGPathSegCurvetoCubicRel.y2 */
-  num y2;
-}