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Previously, we'd just call DisconnectFromEndpoint() and invoke the
callback immediately. This CL adds a "disconnecting" state which waits
for the OnDisconnected() callback to be called. This works around a race
condition in the Nearby Connections library during shutdown.

Because we're now waiting for an event to be called, this CL also adds
timeouts for each step of this flow.

This CL also tweaks the log level for a few logs to help with
debugging.

Bug: 1152609
Change-Id: Ib23c606e4658f5ad1f5fbf013891d80888683530
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2561469Reviewed-by: James Vecore <vecore@google.com>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831160}