Bug 1015248 - [Video] Update to use gaia-header

I don't know why, but the save button is appearing on the line below the header. Full discosure: I had to put in a hack to get it to appear -- I changed https://github.com/mozilla-b2g/gaia/blob/master/apps/video/js/view.js#L47 to 'if (true)'. I'm not sure what the actual use case is that uses the 'save' functionality. I can find out but in terms of testing you can use the same hack as I mentioned above.