Update the call when the network route changes
so that BWE can be updated promptly.

BUG=webrtc:5726
R=mflodman@webrtc.org, pbos@webrtc.org, pthatcher@google.com, pthatcher@webrtc.org, stefan@webrtc.org

Review URL: https://codereview.webrtc.org/1844773002 .

Cr-Original-Commit-Position: refs/heads/master@{#12432}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 0e533ef487f4851d4c6e730bd2d93c9449578c3a