Fix ChildProcessLauncher::SetProcessBackgrounded(...) function.

Fix ChildProcessLauncher::SetProcessBackgrounded(...) function.

Recently class was refactored https://codereview.chromium.org/651253002 ,
and there was an unexpected functional change.

BUG=424816
Committed: https://crrev.com/a13b509667a821c9f0d0b0b54f6854993cac761e
Cr-Commit-Position: refs/heads/master@{#300310}

[Kibeom Kim (inactive), 2014-10-18 08:10:57]

kkimlabs@chromium.org changed reviewers:
+ rvargas@chromium.org

[rvargas (doing something else), 2014-10-20 17:54:00]

LGTM, sorry about that.

[Kibeom Kim (inactive), 2014-10-20 17:54:11]

The CQ bit was checked by kkimlabs@chromium.org

[commit-bot: I haz the power, 2014-10-20 17:54:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/669443002/1

[Kibeom Kim (inactive), 2014-10-20 17:55:24]

The CQ bit was unchecked by kkimlabs@chromium.org

[Kibeom Kim (inactive), 2014-10-20 17:56:38]

kkimlabs@chromium.org changed reviewers:
+ sievers@chromium.org

[Kibeom Kim (inactive), 2014-10-20 17:56:38]

sievers@ : ptal (OWNER)

[no sievers, 2014-10-20 18:09:19]

lgtm

[Kibeom Kim (inactive), 2014-10-20 18:12:45]

The CQ bit was checked by kkimlabs@chromium.org

[commit-bot: I haz the power, 2014-10-20 18:13:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/669443002/1

[commit-bot: I haz the power, 2014-10-20 19:19:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-20 19:20:12]

Patchset 1 (id:??) landed as
https://crrev.com/a13b509667a821c9f0d0b0b54f6854993cac761e
Cr-Commit-Position: refs/heads/master@{#300310}