Revert of ozone: gbm: Default use_system_minigbm=1 to mitigate build breaks

Revert of ozone: gbm: Default use_system_minigbm=1 to mitigate build breaks (patchset #3 id:40001 of https://codereview.chromium.org/1344263002/ )

Reason for revert:
This should work now.

Original issue's description:
> ozone: gbm: Default use_system_minigbm=1 to mitigate build breaks
>
> The chrome-sdk needs to update with the flag to avoid breakage.
> This CL can be reverted when the chrome-sdk updates with the
> new use_system_minigbm setting in GYP_DEFINES.
>
> TBR=dnicoara (build break)
> NOTRY=true
>
> Committed: https://crrev.com/0e8f0106e7e01cee911dd2b34c263c01788e7186
> Cr-Commit-Position: refs/heads/master@{#349041}

TBR=dnicoara@chromium.org

Committed: https://crrev.com/fcef2de97794abf899bb3efe78657355661c7b3d
Cr-Commit-Position: refs/heads/master@{#349450}

[spang, 2015-09-17 16:29:38]

Created Revert of ozone: gbm: Default use_system_minigbm=1 to mitigate build
breaks

[spang, 2015-09-17 16:29:43]

The CQ bit was checked by spang@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-09-17 16:40:31]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1357433003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1357433003/1

[commit-bot: I haz the power, 2015-09-17 18:03:56]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-17 18:03:57]

Dry run: This issue passed the CQ dry run.

[spang, 2015-09-17 18:04:16]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2015-09-17 18:05:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1357433003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1357433003/1

[commit-bot: I haz the power, 2015-09-17 18:11:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-17 18:12:14]

Patchset 1 (id:??) landed as
https://crrev.com/fcef2de97794abf899bb3efe78657355661c7b3d
Cr-Commit-Position: refs/heads/master@{#349450}

[Pawel Osciak, 2015-09-18 02:23:13]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1357573002/ by posciak@chromium.org.

The reason for reverting is: UI does not come up on x86 with below errors:

ERROR:gbm_device.cc(26)] Unable to initialize GBM for /dev/dri/card0: Invalid
argument
ERROR:drm_device_manager.cc(54)] Could not initialize DRM device for
/dev/dri/card0

Revert seems to be fixing that..