GitLab

Use the ukm service for recording background events instead of
manually querying the history service.

Bug: 952870
Change-Id: I5d77954bb48f0197c5f3861888e499d328a2e694
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1593355
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657735}