Do not use suid helper when using the namespace sandbox.

Do not use suid helper when using the namespace sandbox.

After https://codereview.chromium.org/1519753002, sandboxed processes
are no longer marked non-dumpable under the namespace sandbox. This
means that we no longer need to use a suid binary to change oom scores
for those processes.

BUG=312380
Committed: https://crrev.com/baf4d84696ebd6088363888239c3aef5f5a735f7
Cr-Commit-Position: refs/heads/master@{#367671}

[rickyz (no longer on Chrome), 2016-01-05 00:16:04]

rickyz@chromium.org changed reviewers:
+ mdempsky@chromium.org

[mdempsky, 2016-01-05 22:23:59]

lgtm

[rickyz (no longer on Chrome), 2016-01-05 22:25:44]

The CQ bit was checked by rickyz@chromium.org

[commit-bot: I haz the power, 2016-01-05 22:26:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1560033003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1560033003/1

[commit-bot: I haz the power, 2016-01-05 22:39:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-05 22:40:36]

Description was changed from

==========
Do not use suid helper when using the namespace sandbox.

After https://codereview.chromium.org/1519753002, sandboxed processes
are no longer marked non-dumpable under the namespace sandbox. This
means that we no longer need to use a suid binary to change oom scores
for those processes.

BUG=312380
==========

to

==========
Do not use suid helper when using the namespace sandbox.

After https://codereview.chromium.org/1519753002, sandboxed processes
are no longer marked non-dumpable under the namespace sandbox. This
means that we no longer need to use a suid binary to change oom scores
for those processes.

BUG=312380

Committed: https://crrev.com/baf4d84696ebd6088363888239c3aef5f5a735f7
Cr-Commit-Position: refs/heads/master@{#367671}
==========

[commit-bot: I haz the power, 2016-01-05 22:40:37]

Patchset 1 (id:??) landed as
https://crrev.com/baf4d84696ebd6088363888239c3aef5f5a735f7
Cr-Commit-Position: refs/heads/master@{#367671}

[rickyz (no longer on Chrome), 2016-02-05 21:14:16]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1671233002/ by rickyz@chromium.org.

The reason for reverting is: Per issue 576409, an Android kernel patch prevents
non-root users from writing oom_score_adj. Reverting this while we investigate
alternatives..