Convert gn_unittests to run exclusively on Swarming

Convert gn_unittests to run exclusively on Swarming

0 configs already ran on Swarming
3 used to run locally and were converted:
- chromium.linux.json: Linux Tests
- chromium.linux.json: Linux Tests (dbg)(1)
- chromium.linux.json: Linux Tests (dbg)(1)(32)

Ran:
  ./manage.py --convert gn_unittests

BUG=98637
Committed: https://crrev.com/ddcc0a4109ccb62eeac7bd9eaf0efbc22412d8f8
Cr-Commit-Position: refs/heads/master@{#336929}

[Nico, 2015-06-30 22:51:59]

thakis@chromium.org changed reviewers:
+ brettw@chromium.org, maruel@chromium.org

[Nico, 2015-06-30 22:52:00]

brettw: tools/gn
maruel: testing/

https://codereview.chromium.org/1214533005/diff/20001/tools/gn/gn_unittests.i...
File tools/gn/gn_unittests.isolate (right):

https://codereview.chromium.org/1214533005/diff/20001/tools/gn/gn_unittests.i...
tools/gn/gn_unittests.isolate:12: 'format_test_data/',
(i filed https://code.google.com/p/chromium/issues/detail?id=505991 for this)

[Marc-Antoine Ruel (Google), 2015-06-30 22:57:48]

maruel@google.com changed reviewers:
+ maruel@google.com

[Marc-Antoine Ruel (Google), 2015-06-30 22:57:49]

lgtm

[brettw, 2015-06-30 23:19:08]

lgtm

[Nico, 2015-06-30 23:51:44]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2015-06-30 23:52:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1214533005/20001

[commit-bot: I haz the power, 2015-07-01 00:19:54]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-07-01 00:20:48]

Patchset 2 (id:??) landed as
https://crrev.com/ddcc0a4109ccb62eeac7bd9eaf0efbc22412d8f8
Cr-Commit-Position: refs/heads/master@{#336929}

[Nico, 2015-07-23 22:53:29]

Patchset #3 (id:40001) has been deleted