dev-install: drop devmode check

The new C++ wrapper checks this for us.

BUG=chromium:935142
TEST=precq passes

Change-Id: I727db8d57f1194dcc71d13cd176be227f402db83
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/1789857
Reviewed-by: Alex Klein <saklein@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
diff --git a/dev-install/dev_install b/dev-install/dev_install
index 03acb94..b5f64ac 100755
--- a/dev-install/dev_install
+++ b/dev-install/dev_install
@@ -212,13 +212,6 @@
     ;;
   esac
 
-  # This script should only run in developer mode or for developer images.
-  if crossystem "cros_debug?0"; then
-    error "Can not run dev_install."
-    error "Chrome OS is not in developer mode."
-    return 1
-  fi
-
   if [ ${FLAGS_uninstall} -eq ${FLAGS_TRUE} \
        -o ${FLAGS_reinstall} -eq ${FLAGS_TRUE} ]; then
     remove_installed_packages