deadbeef 057ecf01e4 Making WebRtcSession fire a destroyed signal.
This ensures the DtmfSender won't try to access it after it's
destroyed.

BUG=webrtc:5403

Review URL: https://codereview.webrtc.org/1590333004

Cr-Commit-Position: refs/heads/master@{#11327}
2016-01-20 22:30:50 +00:00
..
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