Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/TableRowElement.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 HTMLTableRowElement
-interface TableRowElement extends Element default _Elements {
-
-  TableRowElement();
-
-  /** @domName HTMLTableRowElement.align */
-  String align;
-
-  /** @domName HTMLTableRowElement.bgColor */
-  String bgColor;
-
-  /** @domName HTMLTableRowElement.cells */
-  final HTMLCollection cells;
-
-  /** @domName HTMLTableRowElement.ch */
-  String ch;
-
-  /** @domName HTMLTableRowElement.chOff */
-  String chOff;
-
-  /** @domName HTMLTableRowElement.rowIndex */
-  final int rowIndex;
-
-  /** @domName HTMLTableRowElement.sectionRowIndex */
-  final int sectionRowIndex;
-
-  /** @domName HTMLTableRowElement.vAlign */
-  String vAlign;
-
-  /** @domName HTMLTableRowElement.deleteCell */
-  void deleteCell(int index);
-
-  /** @domName HTMLTableRowElement.insertCell */
-  Element insertCell(int index);
-}