Simple masking frontend - EE

What does this MR do?

Original MR: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/25476 Revert: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/26684

MR was merged but then caused EE tests to fail, new CE and EE versions were made.

This EE MR shouldn't be needed to fix the EE failures since the fix is in the CE portion of the code (these two MRs are identical code-wise)

CE version: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/26751

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/10738 https://gitlab.com/gitlab-org/gitlab-ee/issues/10740