[Video]Bug 1011772 - [video] delete confirmation is incorrect  r=russ

Bugzilla URL:

https://bugzilla.mozilla.org/show_bug.cgi?id=1011772
We would like for this list to become shorter. Therefore, it would be great if you can resolve the jshint errors in dialogs.js. To do that, you can add the following lines at the top of the file:
/* jshint unused: true */
/* global LazyLoader, $ */
/* exported Dialogs */
Also, you can move the function 'close' to line 30 of the file.