cros_run_vm_test: update build target

Change build target to chromiumos_preflight.

BUG=None
TEST=Manual

Change-Id: I25ab91bb94b9dcc44e9117a937060562793738f6
Reviewed-on: https://chromium-review.googlesource.com/1328002
Commit-Ready: Achuith Bhandarkar <achuith@chromium.org>
Tested-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
diff --git a/scripts/cros_run_vm_test.py b/scripts/cros_run_vm_test.py
index 132abaa..b8206f6 100644
--- a/scripts/cros_run_vm_test.py
+++ b/scripts/cros_run_vm_test.py
@@ -102,8 +102,8 @@
     if not self.build:
       return
 
-    cros_build_lib.RunCommand(['autoninja', '-C', self.build_dir, 'chrome',
-                               'chrome_sandbox', 'nacl_helper'])
+    cros_build_lib.RunCommand(['autoninja', '-C', self.build_dir,
+                               'chromiumos_preflight'])
 
   def _Deploy(self):
     """Deploy chrome."""