Revert "Render ImageWallpaper with OpenGL ES and apply visual effects."

This reverts commit 9a8e260a.
Bug: 118658627

Reason for revert:
I've received a few bug reports indicating that images were getting stretched, animations were gone and sometimes nothing would be rendered.

I'll revert the CL to have something for stable for Beta 1. We can then work on the fixes after the Taiwan team is back from vacation.

Change-Id: Id09ba3d7f372af9153c056a12e676c0227d19939