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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=sdefresne@chromium.org

Bug: 1145565
Change-Id: I6079224aa98f835cd8913977b157e02b0a679f90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533136Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Auto-Submit: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826863}