GitLab

Rewrote RTCPeerConnection-lifetime and RTCPeerCOnnection-ontrack
to work with real peerconnections.

Deleted three tests that should have appropriate coverage
in existing WPT tests.

Bug: 771540
Change-Id: I1d5d26bb48ce4993714115bdcfb9ceb2edd02947
Reviewed-on: https://chromium-review.googlesource.com/715597
Commit-Queue: Harald Alvestrand <hta@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509284}