fix RLZ crasher in process_info.cc

fix RLZ crasher in process_info.cc

RLZ is using a very convoluted and fragile way to check for
code running as NT/SYSTEM.

- It can fail, which causes a crash
- It is quite slow on domains
- It is incorrect because "SYSTEM" is not the string in some locales.

BUG=428944
Committed: https://crrev.com/feb83154301ec37a3839ab3e1604de5c4de6b264
Cr-Commit-Position: refs/heads/master@{#302741}

[cpu_(ooo_6.6-7.5), 2014-10-30 22:23:24]

cpu@chromium.org changed reviewers:
+ rogerta@chromium.org

[cpu_(ooo_6.6-7.5), 2014-10-30 22:23:40]

cpu@chromium.org changed reviewers:
+ wfh@chromium.org

[cpu_(ooo_6.6-7.5), 2014-10-30 22:24:02]

ptal

ps. I'll trim the headers if I can.

[Roger Tawa OOO till Jul 10th, 2014-10-30 22:33:02]

lgtm

Thanks Carlos.

[cpu_(ooo_6.6-7.5), 2014-10-31 01:16:00]

The CQ bit was checked by cpu@chromium.org

[commit-bot: I haz the power, 2014-10-31 01:17:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/691913003/1

[commit-bot: I haz the power, 2014-10-31 01:21:38]

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

[commit-bot: I haz the power, 2014-10-31 01:21:39]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[cpu_(ooo_6.6-7.5), 2014-11-05 00:49:25]

The CQ bit was checked by cpu@chromium.org

[commit-bot: I haz the power, 2014-11-05 00:50:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/691913003/20001

[commit-bot: I haz the power, 2014-11-05 00:58:34]

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

[commit-bot: I haz the power, 2014-11-05 00:58:38]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[cpu_(ooo_6.6-7.5), 2014-11-05 01:15:25]

The CQ bit was checked by cpu@chromium.org

[commit-bot: I haz the power, 2014-11-05 01:17:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/691913003/40001

[commit-bot: I haz the power, 2014-11-05 02:02:58]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2014-11-05 02:03:31]

Patchset 3 (id:??) landed as
https://crrev.com/feb83154301ec37a3839ab3e1604de5c4de6b264
Cr-Commit-Position: refs/heads/master@{#302741}