Revert "Settings: Introduce Privacy Guard Manager"

This reverts commit 0bcc7505bf72eb0b528ea41bcd6e06300fa1fce4.
Add gesture based lockscreen security. [2/2]

PS2:
Tidy things up a bit.

Change-Id: I83e3ab643e19b2a2d9c8416f4925bbab05bbc896

Conflicts:

	src/com/android/settings/SecuritySettings.java