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

Bugzilla URL:

https://bugzilla.mozilla.org/show_bug.cgi?id=1011772
It seems this file is mostly the same as the one in gallery. It would be great if you can move apps/gallery/js/dialogs.js to shared/js and then have the video app use the shared file. As an additional bonus, you can resolve the jshint errors and remove all dialogs.js files from xfail.list. To resolve the jshint errors from apps/gallery/js/dialogs.js, add the following at the top of the file:
/* jshint unused: true */
/* global LazyLoader, $, pendingPick */
/* exported Dialogs */

'use strict';
and move the 'close' function to line 32 of the file (line 32 after adding the lines above).