bindings: Moves most of DOM attributes to prototype chains.

LayoutTests/http/tests/notifications/resources/instrumentation-service-worker.js

+importScripts('/resources/testharness-helpers.js');
+
 // Allows a document to exercise the Notifications API within a service worker by sending commands.
 var messagePort = null;
 
 addEventListener('message', function(workerEvent) {
     messagePort = workerEvent.data;
 
     // Listen to incoming commands on the message port.
     messagePort.onmessage = function(event) {
         if (typeof event.data != 'object' || !event.data.command)
             return;
@@ skipping 20 matching lines @@
                 break;
         }
     };
 
     // Notify the controller that the worker is now available.
     messagePort.postMessage('ready');
 });
 
 addEventListener('notificationclick', function(event) {
     // Copies the serializable attributes of the Notification instance on |event|.
-    var notificationCopy = JSON.parse(JSON.stringify(event.notification));
+    var notificationCopy = JSON.parse(stringifyDOMObject(event.notification));
 
     // Notifications containing "ACTION:CLOSE" in their message will be closed
     // immediately by the Service Worker.
     if (event.notification.body.indexOf('ACTION:CLOSE') != -1)
         event.notification.close();
 
     // Notifications containing "ACTION:OPENWINDOW" in their message will attempt
     // to open a new window for an example URL.
     if (event.notification.body.indexOf('ACTION:OPENWINDOW') != -1)
         event.waitUntil(clients.openWindow('https://example.com/'));
 
     messagePort.postMessage({ command: 'click',
                               notification: notificationCopy });
 });