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Device connection states might be out of sync between application
and Bluetooth stack. This could cause deadlock like in b/143964107.

There is no harm to remove this check because Bluetooth stack will
still check device connection state.

Bug: internal b/143964107
Test: Build and run, no longer able to reproduce the issue.
Change-Id: I7737752e29be0f6036ec75621c6dae92a5929a77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900001Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Tiansong Cui <tiansong@google.com>
Auto-Submit: Tiansong Cui <tiansong@google.com>
Cr-Commit-Position: refs/heads/master@{#713086}