GitLab

Part of libcros removal.  Directly writing to the prefs file, instead of going
thru libcros.

BUG=chromium-os:16558
TEST=Go to VT2 and make sure /var/lib/power_manager/lock_on_idle_suspend does not exist (delete if it does).  Type 'stop powerd'.  Sign in as a user.  Press power button to lock screen.  Go to VT2 and look at /var/lib/power_manager/lock_on_idle_suspend.  The file should have been created.
Signed-off-by: Simon Que <sque@chromium.org>

R=satorux@chromium.org,stevenjb@chromium.org


Review URL: http://codereview.chromium.org/8573025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111248 0039d316-1c4b-4281-b951-d872f2087c98