Revert of "Add tab.IsServiceWorkerReadyOrNotRegist() which tells whether serviceworker ..."

telemetry/telemetry/internal/browser/wait_for_serviceworker_registration.js

Index: telemetry/telemetry/internal/browser/wait_for_serviceworker_registration.js
diff --git a/telemetry/telemetry/internal/browser/wait_for_serviceworker_registration.js b/telemetry/telemetry/internal/browser/wait_for_serviceworker_registration.js
deleted file mode 100644
index 20e645233d984d3eadddd5a4a454891160a21239..0000000000000000000000000000000000000000
--- a/telemetry/telemetry/internal/browser/wait_for_serviceworker_registration.js
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright 2017 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.
-
-'use strict';
-
-/**
- * @fileoverview This file provides a JavaScript helper function that
- * determines whether service worker registration has completed.
- */
-(function() {
-  // Make executing this code idempotent.
-  if (window.__telemetry_queryServiceWorkerState) {
-    return;
-  }
-
-  // These variable is used for detecting and waiting service worker
-  // registration.
-  let isServiceWorkerRegistered = false;
-  let isServiceWorkerReady = false;
-
-  // Patch navigator.serviceWorker.register
-  navigator.serviceWorker.originalRegister = navigator.serviceWorker.register;
-  navigator.serviceWorker.register = (name, options = {}) => {
-    isServiceWorkerRegistered = true;
-    navigator.serviceWorker.originalRegister(name, options);
-  };
-
-  navigator.serviceWorker.ready.then(
-      (registration) => { isServiceWorkerReady = true; });
-
-  window.__telemetry_queryServiceWorkerState = () => {
-    // These return string should exactly match strings used in
-    // ServiceWorkerState, in web_contents.py
-    if (!isServiceWorkerRegistered) {
-      return isServiceWorkerReady ? 'unknown state' : 'not registered';
-    }
-    return isServiceWorkerReady ? 'activated' : 'installing';
-  };
-})();