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- There may be other processes in the system which are
  connecting/disconnecting BLE devices.
- We may receive extra disconnect events

Bug: b/110965632
Test: Does not log if called with unrecognized device.
Change-Id: I3059435ea5df6919e12a87852c27e716a0f106b5
Reviewed-on: https://chromium-review.googlesource.com/1119657Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: Bailey Forrest <bcf@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574436}