Remove VideoReceiveStream deregister of decoders.

Remove VideoReceiveStream deregister of decoders.

Also doing some simplifications inside video_coding. No CHECKs added,
since they appear to have introduced breakages in downstream tests.

Overall reducing the number of potential ways a decoder could possibly
be set null. Removing deregistration of external decoders should also
give a quicker shutdown time since that may attempt to register
internal decoders.

BUG=chromium:563299
TBR=stefan@webrtc.org

Committed: https://crrev.com/187db63fdfbfb462a722b685e4a1faf40632d257
Cr-Commit-Position: refs/heads/master@{#10858}

[pbos-webrtc, 2015-12-01 15:04:32]

PTAL, if I'm suuuper lucky the null decoder comes from
DeRegisterExternalDecoders, but I don't see how that's the case. The cleanup
reduces the number of paths this gets reconfigured either way so it could easier
to understand with this landed.

[pbos-webrtc, 2015-12-01 15:04:36]

The CQ bit was checked by pbos@webrtc.org to run a CQ dry run

[commit-bot: I haz the power, 2015-12-01 15:04:41]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1483423002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1483423002/1

[pbos-webrtc, 2015-12-01 16:17:10]

Description was changed from

==========
Remove VideoReceiveStream deregister of decoders.

Also doing some simplifications inside video_coding. No CHECKs added,
since they appear to have introduced breakages in downstream tests.

Overall reducing the number of potential ways a decoder could possibly
be set null. Removing deregistration of external decoders should also
give a quicker shutdown time since that may attempt to register
internal decoders.

BUG=chromium:563299
R=stefan@webrtc.org
==========

to

==========
Remove VideoReceiveStream deregister of decoders.

Also doing some simplifications inside video_coding. No CHECKs added,
since they appear to have introduced breakages in downstream tests.

Overall reducing the number of potential ways a decoder could possibly
be set null. Removing deregistration of external decoders should also
give a quicker shutdown time since that may attempt to register
internal decoders.

BUG=chromium:563299
TBR=stefan@webrtc.org
==========

[pbos-webrtc, 2015-12-01 16:17:20]

TBR= to get this in the next roll

[pbos-webrtc, 2015-12-01 16:20:13]

Description was changed from

==========
Remove VideoReceiveStream deregister of decoders.

Also doing some simplifications inside video_coding. No CHECKs added,
since they appear to have introduced breakages in downstream tests.

Overall reducing the number of potential ways a decoder could possibly
be set null. Removing deregistration of external decoders should also
give a quicker shutdown time since that may attempt to register
internal decoders.

BUG=chromium:563299
TBR=stefan@webrtc.org
==========

to

==========
Remove VideoReceiveStream deregister of decoders.

Also doing some simplifications inside video_coding. No CHECKs added,
since they appear to have introduced breakages in downstream tests.

Overall reducing the number of potential ways a decoder could possibly
be set null. Removing deregistration of external decoders should also
give a quicker shutdown time since that may attempt to register
internal decoders.

BUG=chromium:563299
TBR=stefan@webrtc.org

Committed:
https://chromium.googlesource.com/external/webrtc/+/187db63fdfbfb462a722b685e...
==========

[pbos-webrtc, 2015-12-01 16:20:14]

Committed patchset #1 (id:1) manually as
187db63fdfbfb462a722b685e4a1faf40632d257 (presubmit successful).

[commit-bot: I haz the power, 2015-12-01 16:20:18]

Description was changed from

==========
Remove VideoReceiveStream deregister of decoders.

Also doing some simplifications inside video_coding. No CHECKs added,
since they appear to have introduced breakages in downstream tests.

Overall reducing the number of potential ways a decoder could possibly
be set null. Removing deregistration of external decoders should also
give a quicker shutdown time since that may attempt to register
internal decoders.

BUG=chromium:563299
TBR=stefan@webrtc.org

Committed:
https://chromium.googlesource.com/external/webrtc/+/187db63fdfbfb462a722b685e...
==========

to

==========
Remove VideoReceiveStream deregister of decoders.

Also doing some simplifications inside video_coding. No CHECKs added,
since they appear to have introduced breakages in downstream tests.

Overall reducing the number of potential ways a decoder could possibly
be set null. Removing deregistration of external decoders should also
give a quicker shutdown time since that may attempt to register
internal decoders.

BUG=chromium:563299
TBR=stefan@webrtc.org

Committed: https://crrev.com/187db63fdfbfb462a722b685e4a1faf40632d257
Cr-Commit-Position: refs/heads/master@{#10858}
==========

[commit-bot: I haz the power, 2015-12-01 16:20:19]

Patchset 1 (id:??) landed as
https://crrev.com/187db63fdfbfb462a722b685e4a1faf40632d257
Cr-Commit-Position: refs/heads/master@{#10858}