Require USER_NS for Chrome's layer 1 sandbox.

BUG=chromium:312380
TEST=Tested that this passes on an amd64-generic VM.

Change-Id: I34b987963b537ae584188d4060c4e5b726db9f3e
Reviewed-on: https://chromium-review.googlesource.com/318048
Commit-Ready: Ricky Zhou <rickyz@chromium.org>
Tested-by: Ricky Zhou <rickyz@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
1 file changed