MediaVideoStreamTrack should store weak reference to the media source.

MediaVideoStreamTrack should store weak reference to the media source.
Since MediaVideoStreamSource cann't guarantee to outlive
MediaVideoStreamTrack, directly using its raw pointer might cause the
incorrect use of MediaVideoStreamSource after it is destructed.

BUG=612049
Committed: https://crrev.com/339f60de6b251ae9872fa2c690439aee309b7ea2
Cr-Commit-Position: refs/heads/master@{#394319}

[xjz, 2016-05-16 23:29:59]

xjz@chromium.org changed reviewers:
+ miu@chromium.org

[xjz, 2016-05-16 23:29:59]

PTAL

[miu, 2016-05-17 21:46:20]

The CQ bit was checked by miu@chromium.org

[miu, 2016-05-17 21:46:20]

lgtm

[commit-bot: I haz the power, 2016-05-17 21:47:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1981113002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1981113002/1

[commit-bot: I haz the power, 2016-05-17 23:49:48]

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

[commit-bot: I haz the power, 2016-05-17 23:49:49]

Try jobs failed on following builders:
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)

[xjz, 2016-05-17 23:56:39]

The CQ bit was checked by xjz@chromium.org

[commit-bot: I haz the power, 2016-05-17 23:57:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1981113002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1981113002/1

[commit-bot: I haz the power, 2016-05-18 03:17:52]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-18 03:20:08]

Description was changed from

==========
MediaVideoStreamTrack should store weak reference to the media source.
Since MediaVideoStreamSource cann't guarantee to outlive
MediaVideoStreamTrack, directly using its raw pointer might cause the
incorrect use of MediaVideoStreamSource after it is destructed.

BUG=612049
==========

to

==========
MediaVideoStreamTrack should store weak reference to the media source.
Since MediaVideoStreamSource cann't guarantee to outlive
MediaVideoStreamTrack, directly using its raw pointer might cause the
incorrect use of MediaVideoStreamSource after it is destructed.

BUG=612049

Committed: https://crrev.com/339f60de6b251ae9872fa2c690439aee309b7ea2
Cr-Commit-Position: refs/heads/master@{#394319}
==========

[commit-bot: I haz the power, 2016-05-18 03:20:09]

Patchset 1 (id:??) landed as
https://crrev.com/339f60de6b251ae9872fa2c690439aee309b7ea2
Cr-Commit-Position: refs/heads/master@{#394319}