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

Review URL: https://codereview.chromium.org/1560033003

Cr-Commit-Position: refs/heads/master@{#367671}
1 file changed