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');