Revert of [mb] Switch staging bot to gyp for testing purposes

Revert of [mb] Switch staging bot to gyp for testing purposes (patchset #1 id:1 of https://codereview.chromium.org/2056673002/ )

Reason for revert:
Looks good. Switch back to gn.

Original issue's description:
> [mb] Switch staging bot to gyp for testing purposes
>
> This is to test the migration workflow. Will be reverted
> afterwards.
>
> BUG=chromium:616035
> NOTRY=true
> TBR=vogelheim@chromium.org, jochen@chromium.org
>
> Committed: https://crrev.com/6a5d769be2b97a9ebca8ec58496cb20aed077f18
> Cr-Commit-Position: refs/heads/master@{#36848}

TBR=vogelheim@chromium.org,jochen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:616035
Committed: https://crrev.com/956f28b8163f151bf35ec7594be5af80c31fe882
Cr-Commit-Position: refs/heads/master@{#36861}

[Michael Achenbach, 2016-06-09 13:19:12]

The CQ bit was checked by machenbach@chromium.org

[Michael Achenbach, 2016-06-09 13:19:13]

Created Revert of [mb] Switch staging bot to gyp for testing purposes

[commit-bot: I haz the power, 2016-06-09 13:19:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2050243002/1

[commit-bot: I haz the power, 2016-06-09 13:19:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-09 13:21:45]

Description was changed from

==========
Revert of [mb] Switch staging bot to gyp for testing purposes (patchset #1 id:1
of https://codereview.chromium.org/2056673002/ )

Reason for revert:
Looks good. Switch back to gn.

Original issue's description:
> [mb] Switch staging bot to gyp for testing purposes
> 
> This is to test the migration workflow. Will be reverted
> afterwards.
> 
> BUG=chromium:616035
> NOTRY=true
> TBR=vogelheim@chromium.org, jochen@chromium.org
> 
> Committed: https://crrev.com/6a5d769be2b97a9ebca8ec58496cb20aed077f18
> Cr-Commit-Position: refs/heads/master@{#36848}

TBR=vogelheim@chromium.org,jochen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:616035
==========

to

==========
Revert of [mb] Switch staging bot to gyp for testing purposes (patchset #1 id:1
of https://codereview.chromium.org/2056673002/ )

Reason for revert:
Looks good. Switch back to gn.

Original issue's description:
> [mb] Switch staging bot to gyp for testing purposes
>
> This is to test the migration workflow. Will be reverted
> afterwards.
>
> BUG=chromium:616035
> NOTRY=true
> TBR=vogelheim@chromium.org, jochen@chromium.org
>
> Committed: https://crrev.com/6a5d769be2b97a9ebca8ec58496cb20aed077f18
> Cr-Commit-Position: refs/heads/master@{#36848}

TBR=vogelheim@chromium.org,jochen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:616035

Committed: https://crrev.com/956f28b8163f151bf35ec7594be5af80c31fe882
Cr-Commit-Position: refs/heads/master@{#36861}
==========

[commit-bot: I haz the power, 2016-06-09 13:21:46]

Patchset 1 (id:??) landed as
https://crrev.com/956f28b8163f151bf35ec7594be5af80c31fe882
Cr-Commit-Position: refs/heads/master@{#36861}