Push API: Refactor and fix unsubscribe API

chrome/test/data/push_messaging/service_worker_with_skipWaiting_claim.js

Index: chrome/test/data/push_messaging/service_worker_with_skipWaiting_claim.js
diff --git a/ash/resources/vector_icons/system_menu_arrow_right.icon b/chrome/test/data/push_messaging/service_worker_with_skipWaiting_claim.js
similarity index 59%
copy from ash/resources/vector_icons/system_menu_arrow_right.icon
copy to chrome/test/data/push_messaging/service_worker_with_skipWaiting_claim.js
index 2dc5eacc3a79e1e4880ceaecf0c1d59e37779b57..cc10669aad36fa16e04da6256eeb2c442c6a8fc6 100644
--- a/ash/resources/vector_icons/system_menu_arrow_right.icon
+++ b/chrome/test/data/push_messaging/service_worker_with_skipWaiting_claim.js
@@ -2,9 +2,5 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-CANVAS_DIMENSIONS, 40,
-MOVE_TO, 16, 28,
-R_LINE_TO, 8, -8,
-R_LINE_TO, -8, -8,
-CLOSE,
-END
+self.addEventListener('install', () => skipWaiting());
+self.addEventListener('activate', () => clients.claim());