Revert "Fix outside_chroot_common to match crostestutils."

This reverts commit 9c505210e92977025cada76602dd092979022964.

Hoping this will greenify the tree.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6791024

Change-Id: Ia3dea5e534d6b736309b52643a8fd092b98b42f1
diff --git a/host/outside_chroot_common.sh b/host/outside_chroot_common.sh
index 3cc4f2e..c6a09fa 100644
--- a/host/outside_chroot_common.sh
+++ b/host/outside_chroot_common.sh
@@ -7,10 +7,5 @@
 # Sets script_root relative to this directory.
 
 # From platform/dev/host.
-if [ -f /etc/debian_chroot ]; then
-  echo "Must be run from outside the chroot." 2> /dev/null
-  exit 1
-fi
-
-SCRIPT_ROOT="$(dirname "$(readlink -f "$0")")/../../scripts"
+SCRIPT_ROOT="$(dirname "$(readlink -f "$0")")/../../../scripts"