Font Settings API: UI overhaul of example extension.

chrome/common/extensions/docs/examples/api/fontSettings/js/event_tracker.js

 // Copyright (c) 2011 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.
 
 /** @fileoverview EventTracker is a simple class that manages the addition and
  *  removal of DOM event listeners. In particular, it keeps track of all
  *  listeners that have been added and makes it easy to remove some or all of
  *  them without requiring all the information again. This is particularly
  *  handy when the listener is a generated function such as a lambda or the
  *  result of calling Function.bind.
@@ skipping 77 matching lines @@
    * @param {EventTracker.Entry} h The entry describing the listener to remove.
    * @private
    */
   EventTracker.removeEventListener_ = function(h) {
     h.node.removeEventListener(h.eventType, h.listener, h.capture);
   };
 
   return EventTracker;
 })();