GitLab

Remove RoutingPrefix property from IPConfigUIProperties and add netmask, update network settings UI text from 'Routing Prefix' to 'Subnet Mask'.

Screenshots:
Before:
https://screenshot.googleplex.com/5Tc47C33Hpkx76Q.png

After:
https://screenshot.googleplex.com/8LNYKXVqGNpZq4L.png

Bug: 1100296
Change-Id: Ib7155a71bd2cc24261a9f4d493162bd9fd0aecd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443401
Commit-Queue: Gordon Seto <gordonseto@google.com>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Azeem Arshad <azeemarshad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813460}