Small refactor on send_side_bandwidth_estimation.

R=stefan@webrtc.org
BUG=3065

Review URL: https://webrtc-codereview.appspot.com/10029005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5710 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed