Taylor Brandstetter 389a97c0f4 Fixing leaked reference from SCTP transport to DTLS/ICE transport.
This was causing ICE pings to continue going out on PeerConnections
that use DataChannels, even after closing the PeerConnection.

This CL adds a two-line fix, and an integration test that will catch
this and similar issues.

Bug: webrtc:7655
Change-Id: I589a2a1aaf6433c1d65be69a1267e1b52a33534b
Reviewed-on: https://webrtc-review.googlesource.com/37145
Commit-Queue: Taylor Brandstetter <deadbeef@webrtc.org>
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21488}
2018-01-04 00:53:07 +00:00
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