This reverts commit 89b2963810b4cea0f95abdce011cb4e12fcdf1a1.
Reason for revert: Make experiment default off to not mess up data in re-launch.
Original change's description:
> Reland "Enable simulcast screenshare by default"
>
> This is a reland of d43c692ba7f53b5576a494c0343bc7a4bb36831b after fixes
> to failing chromium tests. No change to the original CL were done.
> Original CL reviewed on: https://webrtc-review.googlesource.com/87560
>
> TBR=stefan@webrtc.org
>
> Bug: chromium:690537
> Change-Id: I6b59ffc90d789aff21c7e52b118d3dfbe756c8a9
> Reviewed-on: https://webrtc-review.googlesource.com/89081
> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
> Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#24013}
TBR=ilnik@webrtc.org,sprang@webrtc.org,stefan@webrtc.org
# Not skipping CQ checks because original CL landed > 1 day ago.
Bug: chromium:690537, b:116052898
Change-Id: I429677de5547ce3a7badfb4414231ff9589e7414
Reviewed-on: https://webrtc-review.googlesource.com/101560
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24798}
b65aa01a90