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This test has been disabled on various platforms because of flakiness
since 2015. Attempts to discover why it was flaky have been fruitless.
We now have other tests (external/wpt/webrtc/simulcast) for testing
simulcast functionality, so the value of fixing this one seems low.

Bug: chromium:452623

Change-Id: I664010899c2a81d64a01c32a067aa93c214d9f46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2190672
Commit-Queue: Harald Alvestrand <hta@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771797}