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This reverts commit 3ab3a892.

Reason for revert: consistently fails on Linux Tests (dbg)(1)

[3865/4436] fast/peerconnection/RTCPeerConnection-insertable-streams.html failed unexpectedly (asserts failed)

Original change's description:
> [RTCInsertableStreams] Add new tests
> 
> These tests verify that data flows normally through senders/receivers
> of one kind when the peer connection has enabled insertable streams
> for the other kind.
> 
> These tests cover the changes in
> https://chromium-review.googlesource.com/c/chromium/src/+/2139231
> 
> Bug: 1068125
> Change-Id: If00ab2cc554eae8632cb0a4fb1d010a7fe5fba3f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2139213
> Reviewed-by: Harald Alvestrand <hta@chromium.org>
> Commit-Queue: Guido Urdaneta <guidou@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#757060}

TBR=hta@chromium.org,guidou@chromium.org

Change-Id: I70968239d8112c53bd32058acfafacf6360ec2b8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1068125
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2140037Reviewed-by: Chris Sharp <csharp@chromium.org>
Commit-Queue: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757146}