Reland of SSRC and RSID may only refer to one sink each in RtpDemuxer

Reland of SSRC and RSID may only refer to one sink each in RtpDemuxer (patchset #1 id:1 of https://codereview.webrtc.org/2993633002/ )

Reason for revert:
Relanding

Original issue's description:
> Revert of SSRC and RSID may only refer to one sink each in RtpDemuxer (patchset #15 id:280001 of https://codereview.webrtc.org/2968693002/ )
> 
> Reason for revert:
> Some internal tests keep failing after this change. Try to fix it by reverting it. Will reland it if this isn't the root cause.
> 
> Original issue's description:
> > SSRC and RSID may only refer to one sink each in RtpDemuxer
> > 
> > RTP demuxing should only match RTP packets with one sink.
> > 
> > BUG=webrtc:7135
> > 
> > Review-Url: https://codereview.webrtc.org/2968693002
> > Cr-Commit-Position: refs/heads/master@{#19233}
> > Committed: https://chromium.googlesource.com/external/webrtc/+/7b7e06fd23ac67d81f378b773bb631abb1d82116
> 
> TBR=nisse@webrtc.org,danilchap@webrtc.org,perkj@webrtc.org,stefan@webrtc.org,holmer@google.com,deadbeef@webrtc.org,pthatcher@webrtc.org,steveanton@webrtc.org,eladalon@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:7135
> 
> Review-Url: https://codereview.webrtc.org/2993633002
> Cr-Commit-Position: refs/heads/master@{#19239}
> Committed: https://chromium.googlesource.com/external/webrtc/+/59b603fbed5b069090f9084c8eeb82eff7bca30c

TBR=nisse@webrtc.org,danilchap@webrtc.org,perkj@webrtc.org,stefan@webrtc.org,holmer@google.com,deadbeef@webrtc.org,pthatcher@webrtc.org,steveanton@webrtc.org,zhihuang@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7135
Review-Url: https://codereview.webrtc.org/2993053002
Cr-Commit-Position: refs/heads/master@{#19248}
Committed: https://chromium.googlesource.com/external/webrtc/+/5daecca41bd8b75069f16647743e32ccaa6e89d2

[eladalon, 2017-08-04 08:58:03]

Created Reland of SSRC and RSID may only refer to one sink each in RtpDemuxer

[eladalon, 2017-08-04 13:34:39]

The CQ bit was checked by eladalon@webrtc.org

[commit-bot: I haz the power, 2017-08-04 13:34:50]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2017-08-04 13:34:54]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1501853679362740, "parent_rev":
"186d9c38733a5e4151be7df55a1220a8c47c8bf4", "commit_rev":
"5daecca41bd8b75069f16647743e32ccaa6e89d2"}

[commit-bot: I haz the power, 2017-08-04 13:34:59]

Description was changed from

==========
Reland of SSRC and RSID may only refer to one sink each in RtpDemuxer (patchset
#1 id:1 of https://codereview.webrtc.org/2993633002/ )

Reason for revert:
Relanding

Original issue's description:
> Revert of SSRC and RSID may only refer to one sink each in RtpDemuxer
(patchset #15 id:280001 of https://codereview.webrtc.org/2968693002/ )
> 
> Reason for revert:
> Some internal tests keep failing after this change. Try to fix it by reverting
it. Will reland it if this isn't the root cause.
> 
> Original issue's description:
> > SSRC and RSID may only refer to one sink each in RtpDemuxer
> > 
> > RTP demuxing should only match RTP packets with one sink.
> > 
> > BUG=webrtc:7135
> > 
> > Review-Url: https://codereview.webrtc.org/2968693002
> > Cr-Commit-Position: refs/heads/master@{#19233}
> > Committed:
https://chromium.googlesource.com/external/webrtc/+/7b7e06fd23ac67d81f378b773...
> 
>
TBR=nisse@webrtc.org,danilchap@webrtc.org,perkj@webrtc.org,stefan@webrtc.org,...
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:7135
> 
> Review-Url: https://codereview.webrtc.org/2993633002
> Cr-Commit-Position: refs/heads/master@{#19239}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/59b603fbed5b069090f9084c8...

TBR=nisse@webrtc.org,danilchap@webrtc.org,perkj@webrtc.org,stefan@webrtc.org,...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7135
==========

to

==========
Reland of SSRC and RSID may only refer to one sink each in RtpDemuxer (patchset
#1 id:1 of https://codereview.webrtc.org/2993633002/ )

Reason for revert:
Relanding

Original issue's description:
> Revert of SSRC and RSID may only refer to one sink each in RtpDemuxer
(patchset #15 id:280001 of https://codereview.webrtc.org/2968693002/ )
> 
> Reason for revert:
> Some internal tests keep failing after this change. Try to fix it by reverting
it. Will reland it if this isn't the root cause.
> 
> Original issue's description:
> > SSRC and RSID may only refer to one sink each in RtpDemuxer
> > 
> > RTP demuxing should only match RTP packets with one sink.
> > 
> > BUG=webrtc:7135
> > 
> > Review-Url: https://codereview.webrtc.org/2968693002
> > Cr-Commit-Position: refs/heads/master@{#19233}
> > Committed:
https://chromium.googlesource.com/external/webrtc/+/7b7e06fd23ac67d81f378b773...
> 
>
TBR=nisse@webrtc.org,danilchap@webrtc.org,perkj@webrtc.org,stefan@webrtc.org,...
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:7135
> 
> Review-Url: https://codereview.webrtc.org/2993633002
> Cr-Commit-Position: refs/heads/master@{#19239}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/59b603fbed5b069090f9084c8...

TBR=nisse@webrtc.org,danilchap@webrtc.org,perkj@webrtc.org,stefan@webrtc.org,...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7135

Review-Url: https://codereview.webrtc.org/2993053002
Cr-Commit-Position: refs/heads/master@{#19248}
Committed:
https://chromium.googlesource.com/external/webrtc/+/5daecca41bd8b75069f166477...
==========

[commit-bot: I haz the power, 2017-08-04 13:35:01]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/5daecca41bd8b75069f166477...