Pass data saver pref value into embedded worker

content/test/data/service_worker/add_save_data_to_title.js

-// Copyright 2014 The Chromium Authors. All rights reserved.
+// 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.
 
 this.onfetch = function(event) {
     var headers = new Headers;
     headers.set('Content-Type', 'text/html; charset=UTF-8');

[falken, 2016/03/09 02:05:36]

It looks like lines 6-7 are not doing anything since headers isn't passed to the
Response constructor. Let's remove them or pass them to the constructor.

[bengr, 2016/03/17 22:24:37]

Good catch. Done.

-    var blob = new Blob(['<title>reload='+ event.isReload + '</title>']);
+    var value = event.request.headers.get('Save-Data');
+    var blob = new Blob(['<title>save-data='+ value + '</title>']);
     var response = new Response(blob);
     event.respondWith(response);
 };