Shutdown PeerConnectionDependencyFactory before Blink shutdown

Shutdown PeerConnectionDependencyFactory before Blink shutdown

WebRTC stuff indirectly touches GCed Blink objects, that requires it to
shutdown before Blink shutdown.

BUG=627004

[tzik, 2016-07-15 05:34:19]

The CQ bit was checked by tzik@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-07-15 05:34:27]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[tzik, 2016-07-15 05:45:37]

Description was changed from

==========
Shutdown PeerConnectionDependencyFactory before Blink shutdown

BUG=
==========

to

==========
Shutdown PeerConnectionDependencyFactory before Blink shutdown

BUG=627004
==========

[tzik, 2016-07-15 05:45:37]

tzik@chromium.org changed reviewers:
+ hbos@webrtc.org, sigbjornf@opera.com

[tzik, 2016-07-15 05:49:42]

Description was changed from

==========
Shutdown PeerConnectionDependencyFactory before Blink shutdown

BUG=627004
==========

to

==========
Shutdown PeerConnectionDependencyFactory before Blink shutdown

WebRTC stuff indirectly touches GCed Blink objects, that requires it to
shutdown before Blink shutdown.

BUG=627004
==========

[tzik, 2016-07-15 05:49:42]

tzik@chromium.org changed reviewers:
+ perkj@chromium.org

[tzik, 2016-07-15 05:51:56]

tzik@chromium.org changed reviewers:
+ esprehn@chromium.org

[tzik, 2016-07-15 05:51:57]

PTAL to:
perkj: c/r/m/webrtc and overall,
esprehn: c/r/render_thread_impl.cc

[commit-bot: I haz the power, 2016-07-15 06:58:20]

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

[commit-bot: I haz the power, 2016-07-15 06:58:22]

Dry run: This issue passed the CQ dry run.

[hbos_chromium, 2016-07-15 08:38:52]

hbos@chromium.org changed reviewers:
+ hbos@chromium.org

[hbos_chromium, 2016-07-15 08:38:53]

lgtm

[perkj_chrome, 2016-07-15 10:29:06]

lgtm but please see the comments in the bug.