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When FastInitiationManager calls the |error_callback_| from
StartAdvertising we destroy the instance in NearbySharingServiceImpl.
After that we can't access local fields anymore as they point to freed
memory.

Bug: b:154846208, 1109581
Change-Id: Ibdecd4c5759051b778ce833a0f70debd2b9b8e3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320174
Commit-Queue: Richard Knoll <knollr@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791948}