RTCQuicTransport bug fix OnConnectionFailure.

Currently when the QUIC connection fails, a DCHECK is hit because the
"failed" state is not interpreted as a closed state. This change fixes
this and also fixes a use after free bug in the QuicTransportProxy.

Bug: 874296
Change-Id: I1982ab9268c22e411f9da11d89b17b4b31a279f9
Reviewed-on: https://chromium-review.googlesource.com/c/1395568
Commit-Queue: Seth Hampson <shampson@chromium.org>
Reviewed-by: Steve Anton <steveanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#620373}
4 files changed