Use the current task queue in the test instead.
R=hbos@webrtc.org
Bug: None
Change-Id: I266796df3de675a808bcf2da08901411fadc86ae
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/176414
Commit-Queue: Evan Shrubsole <eshr@google.com>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31439}