MediaVideoStreamTrack should store weak reference to the media source. Since MediaVideoStreamSource…

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
Review-Url: https://codereview.chromium.org/1981113002
Cr-Commit-Position: refs/heads/master@{#394319}
(cherry picked from commit 339f60de6b251ae9872fa2c690439aee309b7ea2)

Committed: https://chromium.googlesource.com/chromium/src/+/5cfb468a11a4eb74cdab476b9c5b13109117a1a9

[miu, 2016-05-27 21:12:03]

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

Review-Url: https://codereview.chromium.org/1981113002
Cr-Commit-Position: refs/heads/master@{#394319}
(cherry picked from commit 339f60de6b251ae9872fa2c690439aee309b7ea2)
==========

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

Review-Url: https://codereview.chromium.org/1981113002
Cr-Commit-Position: refs/heads/master@{#394319}
(cherry picked from commit 339f60de6b251ae9872fa2c690439aee309b7ea2)

Committed:
https://chromium.googlesource.com/chromium/src/+/5cfb468a11a4eb74cdab476b9c5b...
==========

[miu, 2016-05-27 21:12:04]

Committed patchset #1 (id:1) manually as
5cfb468a11a4eb74cdab476b9c5b13109117a1a9.