GitLab

Transfer ownership of TabManager metrics

Bug: 988753,988788,988800,988807
Change-Id: Ia07028ee94a734236463563070523e6f493be8d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845996Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Commit-Queue: Scott Haseley <shaseley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707433}