LPS-35246 Navbar Page X Delete Button no longer appears

Hey Jon,

Navbar Close Button is working for AUI2 Classic theme now.  It also should work fine for older/deprecated themes.  Some of the code I pulled from a closed pull request which could not merge with new AUI2 Master, but still has a good solution:  https://github.com/jonmak08/liferay-portal/commit/1b5f22e1bae5787134af8c5a5cba5408fbfb4420

The current arrangement is: look for twitter bootstrap structure, or fall back on the old structure.  The way I test for twitter bootstrap structure is in bottom_js.jspf.  Only bootstrap uses the class .nav on the <nav> element.  If you can conceive of a better test that would be great too.

Let me know if you have any questions, thanks!
Patrick