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This reverts commit c2dd88a3.

Reason for revert: broke Meet on Mac Canary, crbug.com/1168301

Original change's description:
> Remove the enabling of RTP data channels.
>
> This is the minimum change to prevent the use of RTP datachannels in Chrome,
> designed to be easily rolled back if needed.
>
> Feature link in Chrome dashboard:
> https://chromestatus.com/feature/6485681910054912
>
> Bug: webrtc:6625
> Change-Id: I19c78f703c8e322d8fa21c120c255942cd2bbd3c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632953
> Reviewed-by: Henrik Boström <hbos@chromium.org>
> Reviewed-by: Guido Urdaneta <guidou@chromium.org>
> Commit-Queue: Harald Alvestrand <hta@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#844489}

TBR=hta@chromium.org,hbos@chromium.org,guidou@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

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

Bug: webrtc:6625
Change-Id: I3cea1636b68ee206c5107a1a8d2c55404236028e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2638598Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844999}