Revert "Lockscreen blur and blur radius (1/2)"

This reverts commit c928fe12e3243ced1235359d0a7a356a7f403ec8.
BlurManager

* Hello guys, this is my BlurManager implemented as a system service + internal API.
The usage is very simple. At the moment you can retrieve a blurred wallpaper, a blurred screenshot of the running activity or blur your custom bitmap.
I'm also working in another api to blur custom views.

To get a blurred screenshot you have to call the prepare() void.

* An interface void will be called once the bitmap is ready returning the blurred bitmap.

You can check my other upcoming commit for blurring recents panel to understand how it works but im sure you'll get it easyli.

This is a little gift for Sean :)

Change-Id: I1b01a287f9b40520bd11f5c74810d98f3d2d1415