Make ExtensionMsg_MessageInvoke run a module system function rather than a

chrome/renderer/resources/extensions/unload_event.js

+// Copyright 2013 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.
+
+// Special unload event. We don't use the DOM unload because that slows down
+// tab shutdown. On the other hand, onUnload might not always fire, since
+// Chrome will terminate renderers on shutdown (SuddenTermination).
+
+// Implement a primitive subset of the Event interface as needed, since if this
+// was to use the real event object there would be a circular dependency.
+var listeners = [];
+
+exports.addListener = function(listener) {
+  listeners.push(listener);
+};
+
+exports.removeListener = function(listener) {
+  for (var i = 0; i < listeners.length; ++i) {
+    if (listeners[i] == listener) {
+      listeners.splice(i, 1);
+      return;
+    }
+  }
+};
+
+exports.wasDispatched = false;
+
+// dispatch() is called from C++.
+exports.dispatch = function() {
+  exports.wasDispatched = true;
+  for (var i = 0; i < listeners.length; ++i)
+    listeners[i]();
+};