Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/IDBCursor.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 IDBCursor
-interface IDBCursor {
-
-  static final int NEXT = 0;
-
-  static final int NEXT_NO_DUPLICATE = 1;
-
-  static final int PREV = 2;
-
-  static final int PREV_NO_DUPLICATE = 3;
-
-  /** @domName IDBCursor.direction */
-  final String direction;
-
-  /** @domName IDBCursor.key */
-  final Dynamic key;
-
-  /** @domName IDBCursor.primaryKey */
-  final Dynamic primaryKey;
-
-  /** @domName IDBCursor.source */
-  final Dynamic source;
-
-  /** @domName IDBCursor.advance */
-  void advance(int count);
-
-  /** @domName IDBCursor.continueFunction */
-  void continueFunction([/*IDBKey*/ key]);
-
-  /** @domName IDBCursor.delete */
-  IDBRequest delete();
-
-  /** @domName IDBCursor.update */
-  IDBRequest update(/*SerializedScriptValue*/ value);
-}