GitLab

Also move ScopedObservation into the base namespace. It's an
oversight that it wasn't there in the first place.

Change-Id: I854bc0c96af72dff096894cd3b82cd7710f6add3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519271Reviewed-by: Patrick Monette <pmonette@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824123}