Remove overlay for lockscreen translucent decor

 * It's the default in 4.2.2 now anyway.

Change-Id: I228adb7c98d8ede769a3e461eec2c8db3b417710
Revert "Enable Pixel Buffer Objects"

This reverts commit d7db37d19c04ce30a2cce3e8316c82c5d292383b.

Change-Id: I0716b417dea3acdd3dda82cb577a3cbaf48e41b8