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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/+/2632953Reviewed-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}