Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/FrameElement.dartdoc

-// 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 HTMLFrameElement
-interface FrameElement extends Element {
-
-  /** @domName HTMLFrameElement.contentDocument */
-  final Document contentDocument;
-
-  /** @domName HTMLFrameElement.contentWindow */
-  final Window contentWindow;
-
-  /** @domName HTMLFrameElement.frameBorder */
-  String frameBorder;
-
-  /** @domName HTMLFrameElement.height */
-  final int height;
-
-  /** @domName HTMLFrameElement.location */
-  String location;
-
-  /** @domName HTMLFrameElement.longDesc */
-  String longDesc;
-
-  /** @domName HTMLFrameElement.marginHeight */
-  String marginHeight;
-
-  /** @domName HTMLFrameElement.marginWidth */
-  String marginWidth;
-
-  /** @domName HTMLFrameElement.name */
-  String name;
-
-  /** @domName HTMLFrameElement.noResize */
-  bool noResize;
-
-  /** @domName HTMLFrameElement.scrolling */
-  String scrolling;
-
-  /** @domName HTMLFrameElement.src */
-  String src;
-
-  /** @domName HTMLFrameElement.width */
-  final int width;
-
-  /** @domName HTMLFrameElement.getSVGDocument */
-  SVGDocument getSVGDocument();
-}