GitLab

Remove constness of the ExtensionHostObserver passed in
OnExtensionHostDestroyed.
This allows scoped observers to stop observing a host that is getting
destroyed.

Fixed: 1086475
Change-Id: I9abc696fe164f26b4927cd7366e1cd04570dbe43
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216211Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Commit-Queue: Fabian Sommer <fabiansommer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775228}