GitLab

The only remaining observer is didChangeTab and it wasn't part of that
bridge.

Bug: 911350
Change-Id: Ibc058d467294ce056979c730a8742ac9436d57b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1627006Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662752}