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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=benwells@chromium.org

Bug: 1145565
Change-Id: I797bd54b97c8b3059fc5d824fff85f1ee296d4f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2548002
Auto-Submit: Sigurður Ásgeirsson <siggi@chromium.org>
Commit-Queue: Ben Wells <benwells@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830106}