Revert of Move the event attach/detach logic on unload from event.js to

chrome/test/data/extensions/api_test/events_are_unregistered/page1.js

-// Copyright 2015 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.
-
-// Register for events in 4 configurations, then navigate to page2.html, which
-// will notify success and succeed the test on the C++ side. The C++ code
-// asserts that the events have been unregistered.
-
-// A single listener.
-chrome.browserAction.onClicked.addListener(function() {});
-// Multiple listeners for the same event.
-chrome.runtime.onStartup.addListener(function() {});
-chrome.runtime.onStartup.addListener(function() {});
-// A single listener, which previously had multiple listeners.
-chrome.runtime.onSuspend.addListener(function() {});
-chrome.runtime.onSuspend.addListener(function() {});
-chrome.runtime.onSuspend.removeListener(function() {});
-// No listeners, which previously had listeners (all were removed).
-chrome.runtime.onInstalled.addListener(function() {});
-chrome.runtime.onInstalled.addListener(function() {});
-chrome.runtime.onInstalled.removeListener(function() {});
-chrome.runtime.onInstalled.removeListener(function() {});
-
-location.assign('page2.html');