Revert of Free SCTP data channels asynchronously in PeerConnection.

Revert of Free SCTP data channels asynchronously in PeerConnection. (patchset #3 id:40001 of https://codereview.webrtc.org/1492383002/ )

Reason for revert:
Breaks WebrtcTransportTest.DataStream, due to different rtc::Thread implementation on Chromium.

Original issue's description:
> Free SCTP data channels asynchronously in PeerConnection.
>
> This is needed so that the data channel isn't deleted while one of its
> own methods is on the call stack.
>
> BUG=565048
>
> Committed: https://crrev.com/386869247f28e72a00307a1b5c92465eea343ad2
> Cr-Commit-Position: refs/heads/master@{#10923}

TBR=pthatcher@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=565048
Committed: https://crrev.com/a1f567ae9012a8de573b5bde492dd9ca0d17f137
Cr-Commit-Position: refs/heads/master@{#10977}

[Taylor Brandstetter, 2015-12-10 19:17:24]

Created Revert of Free SCTP data channels asynchronously in PeerConnection.

[commit-bot: I haz the power, 2015-12-10 19:17:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1513143003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1513143003/1

[commit-bot: I haz the power, 2015-12-10 19:17:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-10 19:17:51]

Description was changed from

==========
Revert of Free SCTP data channels asynchronously in PeerConnection. (patchset #3
id:40001 of https://codereview.webrtc.org/1492383002/ )

Reason for revert:
Breaks WebrtcTransportTest.DataStream, due to different rtc::Thread
implementation on Chromium.

Original issue's description:
> Free SCTP data channels asynchronously in PeerConnection.
> 
> This is needed so that the data channel isn't deleted while one of its
> own methods is on the call stack.
> 
> BUG=565048
> 
> Committed: https://crrev.com/386869247f28e72a00307a1b5c92465eea343ad2
> Cr-Commit-Position: refs/heads/master@{#10923}

TBR=pthatcher@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=565048
==========

to

==========
Revert of Free SCTP data channels asynchronously in PeerConnection. (patchset #3
id:40001 of https://codereview.webrtc.org/1492383002/ )

Reason for revert:
Breaks WebrtcTransportTest.DataStream, due to different rtc::Thread
implementation on Chromium.

Original issue's description:
> Free SCTP data channels asynchronously in PeerConnection.
>
> This is needed so that the data channel isn't deleted while one of its
> own methods is on the call stack.
>
> BUG=565048
>
> Committed: https://crrev.com/386869247f28e72a00307a1b5c92465eea343ad2
> Cr-Commit-Position: refs/heads/master@{#10923}

TBR=pthatcher@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=565048

Committed: https://crrev.com/a1f567ae9012a8de573b5bde492dd9ca0d17f137
Cr-Commit-Position: refs/heads/master@{#10977}
==========

[commit-bot: I haz the power, 2015-12-10 19:17:52]

Patchset 1 (id:??) landed as
https://crrev.com/a1f567ae9012a8de573b5bde492dd9ca0d17f137
Cr-Commit-Position: refs/heads/master@{#10977}

[Taylor Brandstetter, 2015-12-10 19:31:47]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/1516943002/ by deadbeef@webrtc.org.

The reason for reverting is: Relanding with slightly different solution..