Replace enter_chroot with cros_sdk.

BUG=chromium-os:18750
TEST=run it

Change-Id: I21de7acee49abe911c8092365eb8f814777819ae
Reviewed-on: http://gerrit.chromium.org/gerrit/6277
Tested-by: Zdenek Behan <zbehan@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
diff --git a/cros_run_vm_test b/cros_run_vm_test
index 03c529e..4c511eb 100755
--- a/cros_run_vm_test
+++ b/cros_run_vm_test
@@ -68,7 +68,7 @@
 start_kvm "${FLAGS_image_path}"
 retry_until_ssh
 
-"${SCRIPT_ROOT}/enter_chroot.sh" -- run_remote_tests.sh \
+${GCLIENT_ROOT}/chromite/bin/cros_sdk -- run_remote_tests.sh \
     --board=${FLAGS_board} \
     --ssh_port=${FLAGS_ssh_port} \
     --remote=127.0.0.1 \