Fix outside_chroot_common to match crostestutils.

Change-Id: Ic75a10405596cef625d03c0b45a5da8c8a1aeef7

BUG=chromium-os:13498
TEST=Ran cros_start_vm in/outside of chroot

Review URL: http://codereview.chromium.org/6689024
1 file changed