Use RtcpPacket to send REMB in RtcpSender

Use RtcpPacket to send REMB in RtcpSender

BUG=webrtc:2450
R=asapersson@webrtc.org

Committed: https://chromium.googlesource.com/external/webrtc/+/35ab4baa20a730de71b390008900a16563cbbe8e

[sprang_webrtc, 2015-08-13 12:28:52]

sprang@webrtc.org changed reviewers:
+ asapersson@webrtc.org

[åsapersson, 2015-08-17 08:01:10]

lgtm

[sprang_webrtc, 2015-08-17 08:26:35]

The CQ bit was checked by sprang@webrtc.org

[commit-bot: I haz the power, 2015-08-17 08:26:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1290573004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1290573004/1

[commit-bot: I haz the power, 2015-08-17 11:00:45]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-17 11:00:46]

Try jobs failed on following builders:
  mac_baremetal on tryserver.webrtc (JOB_TIMED_OUT, no build URL)

[sprang_webrtc, 2015-08-18 08:27:25]

The CQ bit was checked by sprang@webrtc.org

[commit-bot: I haz the power, 2015-08-18 08:27:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1290573004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1290573004/1

[commit-bot: I haz the power, 2015-08-18 08:28:38]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-18 08:28:39]

Try jobs failed on following builders:
  presubmit on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/presubmit/builds/375)

[sprang_webrtc, 2015-08-18 09:54:25]

Committed patchset #1 (id:1) manually as
35ab4baa20a730de71b390008900a16563cbbe8e (presubmit successful).

[sprang_webrtc, 2015-08-18 11:37:20]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/1300863002/ by sprang@webrtc.org.

The reason for reverting is: A few bots started failing rtc_unittests after this
was commited. Ex
https://build.chromium.org/p/client.webrtc/builders/Linux64%20Debug/builds/5048
.