GitLab

Stop notifying events via old api and replace old API with new API.
This CL is a refactor and has no intended behavior change.

Bug: 842194
Change-Id: I5e11e7323940acbbdc31bd73d599480c7312e8b9
Reviewed-on: https://chromium-review.googlesource.com/c/1314508
Commit-Queue: Sang Woo Ko <sangwoo108@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605584}