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Replace NOTIFICATION_PROFILE_CREATED/DESTROYED with ProfileObserver.

Bug: 268984
Change-Id: I77921a45a79d8bdee9e3a6fc786b5ac6e8c9ee38
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1852412
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706618}