Add method for incrementing RtpPacketCounter. Removes duplicate code.

Correction to check if rtx is enabled on send-side (and not receive) when updating rtx send bitrate stat.

Remove unneeded guarded by annotations.

BUG=
R=mflodman@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/41729004

Cr-Commit-Position: refs/heads/master@{#8239}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8239 4adac7df-926f-26a2-2b94-8c16560cd09d
7 files changed