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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=pkasting@chromium.org, tluk@chromium.org

Bug: 1145565
Change-Id: Ifb06297c295ec0b76e7380bc3d3787bc72a4b411
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547776
Auto-Submit: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829257}