Typecheck chrome://help using CompilerPass.java, everything except dependency to options

ui/webui/resources/js/event_tracker.js

Index: ui/webui/resources/js/event_tracker.js
diff --git a/ui/webui/resources/js/event_tracker.js b/ui/webui/resources/js/event_tracker.js
index e7bb5d350dcae367cb2fb578cfd01bdf9da58d1e..d28c5b7ff55130fb542616680ec41a5370762557 100644
--- a/ui/webui/resources/js/event_tracker.js
+++ b/ui/webui/resources/js/event_tracker.js
@@ -42,7 +42,7 @@ EventTracker.prototype = {
    * Add an event listener - replacement for Node.addEventListener.
    * @param {!Node} node The DOM node to add a listener to.
    * @param {string} eventType The type of event to subscribe to.
-   * @param {Function} listener The listener to add.
+   * @param {EventListener|Function} listener The listener to add.
    * @param {boolean=} opt_capture Whether to invoke during the capture phase.
    */
   add: function(node, eventType, listener, opt_capture) {