Follow up: stop mirroring session when tab is closed.

Follow up: stop mirroring session when tab is closed.
Rename the callback function and clarify the logic to prevent same
bug happen again in future.

BUG=655240
Committed: https://crrev.com/7be1ce80e3dbf1f42a0c6568d5d894b508e47af7
Cr-Commit-Position: refs/heads/master@{#426327}

[xjz, 2016-10-19 18:11:02]

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

[commit-bot: I haz the power, 2016-10-19 18:11:32]

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

[xjz, 2016-10-19 18:12:40]

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

[xjz, 2016-10-19 18:12:40]

PTAL

[commit-bot: I haz the power, 2016-10-19 18:28:38]

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

[commit-bot: I haz the power, 2016-10-19 18:28:39]

Dry run: Try jobs failed on following builders:
  mac_chromium_rel_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[xjz, 2016-10-19 19:10:32]

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

[commit-bot: I haz the power, 2016-10-19 19:11:13]

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

[commit-bot: I haz the power, 2016-10-19 21:33:37]

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

[commit-bot: I haz the power, 2016-10-19 21:33:37]

Dry run: This issue passed the CQ dry run.

[miu, 2016-10-19 22:53:36]

lgtm! Thanks for the follow-up. It will help eliminate the same confusion for
the next developers that touch this code. :)

[xjz, 2016-10-19 22:55:27]

The CQ bit was checked by xjz@chromium.org

[commit-bot: I haz the power, 2016-10-19 22:56:16]

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

[commit-bot: I haz the power, 2016-10-19 23:18:59]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-10-21 13:12:55]

Description was changed from

==========
Follow up: stop mirroring session when tab is closed.
Rename the callback function and clarify the logic to prevent same
bug happen again in future.

BUG=655240
==========

to

==========
Follow up: stop mirroring session when tab is closed.
Rename the callback function and clarify the logic to prevent same
bug happen again in future.

BUG=655240

Committed: https://crrev.com/7be1ce80e3dbf1f42a0c6568d5d894b508e47af7
Cr-Commit-Position: refs/heads/master@{#426327}
==========

[commit-bot: I haz the power, 2016-10-21 13:12:56]

Patchset 2 (id:??) landed as
https://crrev.com/7be1ce80e3dbf1f42a0c6568d5d894b508e47af7
Cr-Commit-Position: refs/heads/master@{#426327}