Update SSRC in RtpRtcp for audio channel so that it can have NTP values for further AV sync.
Update SSRC in RtpRtcp for audio channel so that it can have NTP values for further AV sync.

Background:
Since we had http://review.webrtc.org/2048004, the SSRC value in
RtpRtcp for audio hasn't been updated. Because this prevents NTP update in RtpRtcp, the sync logic in ViESyncModule::Process() does not work.

BUG=b/10484087
TEST= pass 'git try' except tests already broken in http://build.chromium.org/p/tryserver.webrtc/console
R=henrika@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2131004

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@4638 4adac7df-926f-26a2-2b94-8c16560cd09d

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