Expose toString() as enumerable on some objects.

third_party/WebKit/Source/core/html/HTMLHyperlinkElementUtils.idl

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // https://html.spec.whatwg.org/#htmlhyperlinkelementutils
 
 [
     NoInterfaceObject, // Always used on target of 'implements'
 ] interface HTMLHyperlinkElementUtils {
-    // TODO(sof): 'stringifier' entails an enumerable toString(),
-    //   http://heycam.github.io/webidl/#es-stringifier
-    // something implementations of HTMLHyperlinkElementUtils currently
-    // provide. Make them to comply with the spec (http://crbug.com/306606).
-    //
-    // Until that time, do not use 'stringifier'.
-    // stringifier attribute USVString href;
-    attribute USVString href;
-    [NotEnumerable, ImplementedAs=href] USVString toString();
+    stringifier attribute USVString href;
     readonly attribute USVString origin;
 
     attribute USVString protocol;
     attribute USVString username;
     attribute USVString password;
     attribute USVString host;
     attribute USVString hostname;
     attribute USVString port;
     attribute USVString pathname;
     attribute USVString search;
     attribute USVString hash;
 };