navbar_icon was renamed to custom_icon
In https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4909 it's still using navbar_icon but now it's renamed to custom_icon in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5156
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
In https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4909 it's still using navbar_icon but now it's renamed to custom_icon in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5156