Fix bug where a connection switch causes BWE to be set to zero.

BUG=webrtc:6076
R=sprang@webrtc.org

Review URL: https://codereview.webrtc.org/2125523004 .

Cr-Original-Commit-Position: refs/heads/master@{#13414}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: be40296ccef50dd79312c6fce533bfa36b7063dc
2 files changed