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We might receive command complete callbacks after device is disconnected.
Because we have already cleared the command queue, this will result in
DCHECK fail in eng builds or segmentation fault in user builds.
We fix this issue and avoid device crash in this case.

Bug: internal b/135691184
Test: cast_bluetooth_unittests, manual
Change-Id: Ic086f56734fa20e836341768bfe7c3187de92fe0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1673084
Auto-Submit: Tiansong Cui <tiansong@google.com>
Commit-Queue: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671547}