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All observers of the AccessibilityController shall be removed before the
AccessibilityController is destroyed.

Change-Id: I8b4cab4ce71a3bfb53c2f04b940dde218a494124
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816301
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698628}