NavBar: Add collapsePanels() to notification navbar target

Change-Id: I18b6adcb9ff829045e6c145235c970ef8e6368f8
Signed-off-by: bmc08gt <bmc08gt.teamb00sted@gmail.com>
SystemUI: unregister ContentObserver

We were leaking memory.

Change-Id: Id40e7dd78c879a6b7fa4ff7584e47a6005dfefda
PS2: move instanciating to the SearchPanelView constructor
PS3: more possible memory leaks