Revert of Extend chromium_tests trigger to work across masters.

Revert of Extend chromium_tests trigger to work across masters. (patchset #3 id:40001 of https://codereview.chromium.org/1928783004/ )

Reason for revert:
I strongly suspect this severely broke build triggering:

https://build.chromium.org/p/chromium.linux/builders/Linux%20Builder/builds/65880/steps/trigger/logs/stdio

crbug.com/608167

Original issue's description:
> Extend chromium_tests trigger to work across masters.
> 
> A bot can specify "parent_mastername" to choose which master to trigger from.
> Also, merge all the trigger steps to one. For perf bots, it was generating 20+ steps.
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=300383

TBR=phajdan.jr@chromium.org,dtu@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=300384

[Dirk Pranke, 2016-04-30 18:10:19]

Created Revert of Extend chromium_tests trigger to work across masters.

[commit-bot: I haz the power, 2016-04-30 18:10:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1932213004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1932213004/1

[commit-bot: I haz the power, 2016-04-30 18:11:06]

Description was changed from

==========
Revert of Extend chromium_tests trigger to work across masters. (patchset #3
id:40001 of https://codereview.chromium.org/1928783004/ )

Reason for revert:
I strongly suspect this severely broke build triggering:

https://build.chromium.org/p/chromium.linux/builders/Linux%20Builder/builds/6...

crbug.com/608167

Original issue's description:
> Extend chromium_tests trigger to work across masters.
> 
> A bot can specify "parent_mastername" to choose which master to trigger from.
> Also, merge all the trigger steps to one. For perf bots, it was generating 20+
steps.
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=300383

TBR=phajdan.jr@chromium.org,dtu@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========

to

==========
Revert of Extend chromium_tests trigger to work across masters. (patchset #3
id:40001 of https://codereview.chromium.org/1928783004/ )

Reason for revert:
I strongly suspect this severely broke build triggering:

https://build.chromium.org/p/chromium.linux/builders/Linux%20Builder/builds/6...

crbug.com/608167

Original issue's description:
> Extend chromium_tests trigger to work across masters.
> 
> A bot can specify "parent_mastername" to choose which master to trigger from.
> Also, merge all the trigger steps to one. For perf bots, it was generating 20+
steps.
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=300383

TBR=phajdan.jr@chromium.org,dtu@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=300384
==========

[commit-bot: I haz the power, 2016-04-30 18:11:08]

Committed patchset #1 (id:1) as
http://src.chromium.org/viewvc/chrome?view=rev&revision=300384