Let the test expect calls to onRenegotiationNeeded(), as introduced by https://codereview.webrtc.org/2977493002. Bug: webrtc:7761 Change-Id: If8e3c484236f6599cc225a0398bbbc9cf6c356a5 Reviewed-on: https://webrtc-review.googlesource.com/48364 Reviewed-by: Sami Kalliomäki <sakal@webrtc.org> Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org> Commit-Queue: Rasmus Brandt <brandtr@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23165}