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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=jdiggs@igalia.com

Bug: 1145565
Change-Id: I7c12763d1b3461e3d66280174dc6164c46b63c1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526902Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Auto-Submit: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826447}