Revert of Create xfer processor backend.

Revert of Create xfer processor backend. (patchset #6 id:100001 of https://codereview.chromium.org/764643004/)

Reason for revert:
CL breaks windows DM

Original issue's description:
> Create xfer processor backend.
> 
> This includes:
> -Having an actual XP stage at the end of the gl pipeline.
> -All Blending work is handled by XP until actually setting GL blend states
> -GLPrograms test to test XP
> 
> BUG=skia:
> 
> Committed: https://skia.googlesource.com/skia/+/4dffc940c430eec66d4707490eace19c9b3f7904

TBR=bsalomon@google.com,joshualitt@chromium.org,egdaniel@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/294738268d3a9317282224f03063eb38ad19717c

[joshualitt, 2014-12-10 22:57:55]

Created Revert of Create xfer processor backend.

[commit-bot: I haz the power, 2014-12-10 22:58:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/789343002/1

[commit-bot: I haz the power, 2014-12-10 23:03:05]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/294738268d3a9317282224f03063eb38ad19717c