Danil Chapovalov 4f779c6aec Remove legacy empty task_queue BUILD targets and build arg
Now that they are unused

Bug: webrtc:10191
Change-Id: Id5f1b70ed8e084555ca809fef2a75359266f2ca1
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/126980
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27070}
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