Honghai Zhang 17b92cb219 Revert "Stop using and delete DEPRECATED_SingleThreadedTaskQueueForTesting"
This reverts commit b1c1f6907fec2d18ae8b00ebc44975cb46a95b11.

Reason for revert: It may be the cause of iOS64 Debug flakyness. 

Original change's description:
> Stop using and delete DEPRECATED_SingleThreadedTaskQueueForTesting
> 
> Bug: webrtc:10933
> Change-Id: I8307e2aad06d3f3f367af122e43ecc088b52f2d6
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/157896
> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
> Reviewed-by: Sebastian Jansson <srte@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#29713}

TBR=danilchap@webrtc.org,srte@webrtc.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: webrtc:10933
Change-Id: I94c86ebbae414a7569f253d199efbde6ac4c3765
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/159101
Reviewed-by: Honghai Zhang <honghaiz@webrtc.org>
Commit-Queue: Honghai Zhang <honghaiz@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29737}
2019-11-07 23:43:07 +00:00
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