Update ICE role on all ports, not just ones used for new connections.

Previously, if the ICE role changed, SetIceRole was only called on
the ports from the most recent ICE generation. However, STUN pings
may still be sent and received by older generation ports, so they
should receive an updated role as well.

This was previously triggering an ASSERT, because a P2PTransportChannel
expects the ICE role of each of its ports to match its own role.

Committed: https://crrev.com/370544594e18deb7f560f961295c8cf3f0a679f1
Review-Url: https://codereview.webrtc.org/2053043003
Cr-Original-Commit-Position: refs/heads/master@{#13247}
Cr-Original-Original-Commit-Position: refs/heads/master@{#13226}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: dfc4244d9efb1f2f340a5c88fa55f3a03e1e372e
4 files changed