don't try to adjust oom score with the suid sandbox if there is no such binary

don't try to adjust oom score with the suid sandbox if there is no such binary

BUG=312380
Committed: https://crrev.com/d372b27a99e6827fd87a95bc802431ee83b81c08
Cr-Commit-Position: refs/heads/master@{#360262}

[Mostyn Bramley-Moore, 2015-11-18 01:20:15]

The CQ bit was checked by mostynb@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2015-11-18 01:21:09]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1452403003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1452403003/1

[Mostyn Bramley-Moore, 2015-11-18 01:21:58]

mostynb@opera.com changed reviewers:
+ rickyz@chromium.org

[Mostyn Bramley-Moore, 2015-11-18 01:21:58]

@rickyz: this small change avoids a useless error message in
base/process/launch_posix.cc if there is no suitable setuid sandbox binary.

[Mostyn Bramley-Moore, 2015-11-18 01:22:45]

Oh BTW, the useless error message is: "LaunchProcess: failed to execvp:"
(without any further information).

[rickyz (no longer on Chrome), 2015-11-18 01:23:16]

lgtm, thanks!

[Mostyn Bramley-Moore, 2015-11-18 01:23:48]

The CQ bit was unchecked by mostynb@opera.com

[Mostyn Bramley-Moore, 2015-11-18 01:23:52]

The CQ bit was checked by mostynb@opera.com

[commit-bot: I haz the power, 2015-11-18 01:25:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1452403003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1452403003/1

[commit-bot: I haz the power, 2015-11-18 02:11:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-18 02:11:49]

Patchset 1 (id:??) landed as
https://crrev.com/d372b27a99e6827fd87a95bc802431ee83b81c08
Cr-Commit-Position: refs/heads/master@{#360262}