Erik Språng 5fc59e810b Refactor NACK bitrate allocation
Nack bitrate allocation should not be done on a per-rtp-module basis,
but rather shared bitrate pool per call. This CL moves allocation to the
pacer and cleans up a bunch if bitrate stats handling.

BUG=
R=danilchap@webrtc.org, stefan@webrtc.org, tommi@webrtc.org

Review URL: https://codereview.webrtc.org/2061423003 .

Cr-Commit-Position: refs/heads/master@{#13416}
2016-07-08 16:15:29 +00:00
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