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Because base::ScopedObservation is strictly a singular observation,
it has exposed at least one latent release blocker bug on replacing
ScopedObserver. Unfortunately this manifested as a use-after-free, as
there was no test or build with DCHECK_IS_ON that covered this case.
See https://crbug.com/1153961#c14 for the details.

Bug: 1145565
Change-Id: Ibe198ca413e94676fa5dac3b94837b9999b3cb59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627763Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843641}