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ScopedObserver is being deprecated in favor of two new classes:
- base::ScopedObservation for observers that only ever observe
  a single source.
- base::ScopedMultiSourceObservation for observers that do or may
  observe more than a single source.

This CL was uploaded by git cl split.

R=jdonnelly@chromium.org

Bug: 1145565
Change-Id: Id17e64fb0132a99c583e2670c5cd84fb2f34bc8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533154
Auto-Submit: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826764}