GitLab

about_flags.cc today opt in/out configurations manually, rather
than using the existing ENABLE_NATIVE_NOTIFICATIONS build flag.

This fixes the OZONE/Linux build.

BUG=676220
R=thomasanderson@google.com

Review-Url: https://codereview.chromium.org/2802243002
Cr-Commit-Position: refs/heads/master@{#462896}