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This is a minimal fix - move the generation of the track (which
causes onnegotiationneeded) to before we set the expectation that
no event will be fired.

Bug: chromium:905563
Change-Id: I879f6eb6130d719d7eaad71fed85044b690f0cb9
Reviewed-on: https://chromium-review.googlesource.com/c/1346030Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Harald Alvestrand <hta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609999}