GitLab

This crash is still appearing and I think |owner_|
might be going away and cause the seg fault.

This removes |owner_| from MediaNotificationBackground.

BUG=994395

Change-Id: I59364ea14e9e7614728dac1e227133bcf76733c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1772375Reviewed-by: Tommy Steimel <steimel@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690768}