Revert of GVDA, vdatest: Enable V4L2SliceVideoDecodeAccelerator.

Revert of GVDA, vdatest: Enable V4L2SliceVideoDecodeAccelerator. (patchset #1 id:1 of https://codereview.chromium.org/808973004/)

Reason for revert:
Dependent on https://codereview.chromium.org/852103002/ which was reverted due to arm breakage

Original issue's description:
> GVDA, vdatest: Enable V4L2SliceVideoDecodeAccelerator.
>
> Instantiate V4L2SVDA in GVDA and vdatest to be used if the hardware
> cannot support the current frame-based API and try to use slice-based API
> instead.
>
> BUG=chrome-os-partner:33728
> TEST=vdatest,veatest,apprtc,video playback
>
> Committed: https://crrev.com/daa138be4bc9374516fa0f779cc5e5fb8c38fbe4
> Cr-Commit-Position: refs/heads/master@{#311465}

TBR=wuchengli@chromium.org,henryhsu@chromium.org,kcwu@chromium.org,posciak@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=chrome-os-partner:33728
Committed: https://crrev.com/1432aeceee28c673add5c722cb2edf37cab1ff73
Cr-Commit-Position: refs/heads/master@{#311566}

[Ken Rockot(use gerrit already), 2015-01-14 22:50:08]

Created Revert of GVDA, vdatest: Enable V4L2SliceVideoDecodeAccelerator.

[commit-bot: I haz the power, 2015-01-14 22:51:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/848233002/1

[commit-bot: I haz the power, 2015-01-14 22:52:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-14 22:54:43]

Patchset 1 (id:??) landed as
https://crrev.com/1432aeceee28c673add5c722cb2edf37cab1ff73
Cr-Commit-Position: refs/heads/master@{#311566}