Bug 1055198 - [Video] Hide soft home key during full screen video playba...

...ck
This was a good catch because we don't want to request fullscreen during a pick activity. That would force the "caller" apps to use "fullscreen_layout" in their manifest which would force them to update their layout to account for the software home button -- instead of it happening automatically. I will update the patch to not request fullscreen during pick activities.