SystemUI: fix memory leaks

ContentObservers are being registered without being unregistered,
causing old objects not to be garbage collected. This causes memory
leak if the classes are destroyed and recreated throughout the
device's uptime.

SearchPanelView is recreated every time the screen is turned on.
StatusBarIconView is created every time a notification is triggered.

JIRA: CYAN-650
Change-Id: Iabd3221fc2b0c848396af1790fd09424be602e7e

Conflicts:
	packages/SystemUI/src/com/android/systemui/SearchPanelView.java
	packages/SystemUI/src/com/android/systemui/statusbar/StatusBarIconView.java
SystemUI: partial revert of 3f72751c, we already had the fix in SearchPanelView

Signed-off-by: Gergely Szell (sethyx) <szell@hu.ibm.com>

Change-Id: I05d9b000638c9ea0083a8a95cb199811a89164b4
wifi: Fix StringIndexOutOfBoundsException for incorrectly encoded SSIDs

If the last character of a SSID is a unescaped backslash then WifiSsid
convertToBytes() will throw a StringIndexOutOfBoundsException and takes the
whole ROM down.

The issue was reported by andreip in the HTC One X XDA thread. His SSID was
set to "/ Andrew \".

04-10 21:33:54.265 E/AndroidRuntime(10479): *** FATAL EXCEPTION IN SYSTEM PROCESS: WifiStateMachine
04-10 21:33:54.265 E/AndroidRuntime(10479): java.lang.StringIndexOutOfBoundsException: length=10; index=10
04-10 21:33:54.265 E/AndroidRuntime(10479):     at android.net.wifi.WifiSsid.convertToBytes(WifiSsid.java:89)
04-10 21:33:54.265 E/AndroidRuntime(10479):     at android.net.wifi.WifiSsid.createFromAsciiEncoded(WifiSsid.java:54)
04-10 21:33:54.265 E/AndroidRuntime(10479):     at android.net.wifi.WifiStateMachine.setScanResults(WifiStateMachine.java:1522)
04-10 21:33:54.265 E/AndroidRuntime(10479):     at android.net.wifi.WifiStateMachine.access$7100(WifiStateMachine.java:103)
04-10 21:33:54.265 E/AndroidRuntime(10479):     at android.net.wifi.WifiStateMachine$SupplicantStartedState.processMessage(WifiStateMachine.java:2511)
04-10 21:33:54.265 E/AndroidRuntime(10479):     at com.android.internal.util.StateMachine$SmHandler.processMsg(StateMachine.java:905)
04-10 21:33:54.265 E/AndroidRuntime(10479):     at com.android.internal.util.StateMachine$SmHandler.handleMessage(StateMachine.java:760)
04-10 21:33:54.265 E/AndroidRuntime(10479):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-10 21:33:54.265 E/AndroidRuntime(10479):     at android.os.Looper.loop(Looper.java:137)
04-10 21:33:54.265 E/AndroidRuntime(10479):     at android.os.HandlerThread.run(HandlerThread.java:60)

Change-Id: I8273decacfffea4e4cae3bb957c925833dab09e2