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The OneTimeGeolocationPermissionProvider tries to unregister itself from an already shutdown context, causing the crash.
Update the observer unregistration pattern in the OneTimeGeolocationPermissionProvider to handle the case of the context being already shutdown.

Bug: 1168488
Change-Id: Id92b9a3b15410b3732d9021a666282ad1f568036
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640096
Commit-Queue: Ravjit Singh Uppal <ravjit@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Ravjit Singh Uppal <ravjit@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845321}