Add OWNERS to third_party/devscripts

third_party/devscripts is missing an OWNERS file,
which it should have, and its absence means changes need to be approved by general third_party owners.

This CL creates one, essentially the same as tools/checklicenses, as that's the script that uses this and these are the main editors of these files (per git blame):
phajdan.jr@chromium.org
thestig@chromium.org
(without the 'set noparent', as parent approval ok in third_party)

The absence of OWNERS caused presubmit failure on below issue, which this CL fixes:
Issue 16426003: Add footer license check to licensecheck.pl and Perl to checklicenses.py
https://chromiumcodereview.appspot.com/16426003/

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=205073

[Nils Barth (inactive), 2013-06-07 06:06:27]

Hiyas Brett/Carlos/Darin,

Quick CL adding OWNERS to third_party/devscripts
so you don't have to approve CLs yourselves,
and can instead let Paweł and Lei do it.

Cheers, Nils

[cpu_(ooo_6.6-7.5), 2013-06-07 17:59:03]

lgtm

[commit-bot: I haz the power, 2013-06-08 10:43:08]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/nbarth@chromium.org/16621002/1

[commit-bot: I haz the power, 2013-06-08 12:27:49]

Retried try job too often on mac_rel for step(s) unit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2013-06-08 12:36:24]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/nbarth@chromium.org/16621002/1

[commit-bot: I haz the power, 2013-06-08 16:46:27]

Change committed as 205073