Reduce memory leaks by removing all views.

Change-Id: I1c7d3647ae0d40aa214108ea22e007e3cb3191b9

Patchset: 3
http://review.cyanogenmod.org/#/c/63034/

Comments from Clark:

The results from people trying out this patch are very positive
and we may want to go ahead and merge this in for the time being.
A better solution can always be implemented later on but if this
is reducing the possibility of memory leaks in SystemUI then I
say we merge this ASAP.