Revert of Wire InstallFinished and add some InstallEvent.waitUntil tests

content/test/data/service_worker/worker_install_rejected.js

Index: content/test/data/service_worker/worker_install_rejected.js
diff --git a/content/test/data/service_worker/worker_install_rejected.js b/content/test/data/service_worker/worker_install_rejected.js
deleted file mode 100644
index c57ab6f542fa3e67484d9535f5fffec968d302ff..0000000000000000000000000000000000000000
--- a/content/test/data/service_worker/worker_install_rejected.js
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright 2014 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.oninstall = function(event) {
-    event.waitUntil(new Promise(function(resolve, reject) {
-        setTimeout(reject, 5);
-    }));
-};