Tidy up UserMediaController references from mediastream request objects.

Tidy up UserMediaController references from mediastream request objects.

References to the UserMediaController GCed object need to be traced;
add missing Member<> refs + trace over these.

R=haraken
BUG=340522
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=186932

[sof, 2014-12-10 22:13:24]

sigbjornf@opera.com changed reviewers:
+ oilpan-reviews@chromium.org

[sof, 2014-12-10 22:13:25]

Please take a look.

[haraken, 2014-12-10 23:40:08]

LGTM

[haraken, 2014-12-10 23:40:11]

The CQ bit was checked by haraken@chromium.org

[commit-bot: I haz the power, 2014-12-10 23:41:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/791033003/1

[commit-bot: I haz the power, 2014-12-11 00:01:09]

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

[commit-bot: I haz the power, 2014-12-11 00:01:10]

Try jobs failed on following builders:
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/34731)

[sof, 2014-12-11 08:07:52]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2014-12-11 08:08:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/791033003/20001

[commit-bot: I haz the power, 2014-12-11 09:51:22]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=186932