Revert "Keyguard: Add customizable lockscreen background"

This reverts commit 060230306035aec74690e64a4e4f030e679f1d51.
Revert "Keyguard: Add support for a custom lockscreen message"

This reverts commit ed4c0a52ccc8f71215501eb19de8b0589340fb5e.
Revert "Keyguard: add lockscreen translucent/rotation toggles"

This reverts commit 0cba049e2d3e882d77fb17b83fba5c6753de67ab.
Frameworks: Lockscreen custom wallpaper (1/2)

kitkat now has code for a custom wallpaper image.

Using that code set a switch case to set the custom background between
  - Custom Wallpaper
  - Default background

This way allows the same overlay shadow thats set on the keyguard when
its the defualt way.

Change-Id: I98fde63ef9f3c0a5f334cd9a97b237a6f99c57f6
Lockscreen: Fix SystemUI crash on initial selection of Custom Background.

Change-Id: I8df4984f4b90d211baa888d380a95fc00a85d1ad
systemui: Fix crash on theme change

 * Avoid NPE on theme change on devices without a navigation bar.

Change-Id: I29321e7747e7aa87f4539913b5a071f6e7d6a72d