VideoCaptureManager: handle case when GetDeviceEntryBySessionId is null

VideoCaptureManager: handle case when GetDeviceEntryBySessionId is null

VCM's l.553 uses GetDeviceEntryBySessionId(request->first) without
checking the result, that could be null, and is, speculatively, the
root cause of the crashes linked in the bug.

BUG=655522
Committed: https://crrev.com/124fafd9aae60044673495b39a775a931cbdf90e
Cr-Commit-Position: refs/heads/master@{#425072}

[mcasas, 2016-10-13 14:54:06]

mcasas@chromium.org changed reviewers:
+ xianglu@chromium.org

[mcasas, 2016-10-13 14:54:07]

xianglu@ PTAL

[mcasas, 2016-10-13 16:05:06]

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

[commit-bot: I haz the power, 2016-10-13 16:05:29]

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, 2016-10-13 16:54:15]

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

[commit-bot: I haz the power, 2016-10-13 16:54:17]

Dry run: This issue passed the CQ dry run.

[xianglu, 2016-10-13 17:00:05]

lgtm

[mcasas, 2016-10-13 17:07:32]

The CQ bit was checked by mcasas@chromium.org

[commit-bot: I haz the power, 2016-10-13 17:08:00]

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, 2016-10-13 17:13:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-13 17:17:25]

Description was changed from

==========
VideoCaptureManager: handle case when GetDeviceEntryBySessionId is null

VCM's l.553 uses GetDeviceEntryBySessionId(request->first) without
checking the result, that could be null, and is, speculatively, the
root cause of the crashes linked in the bug.

BUG=655522
==========

to

==========
VideoCaptureManager: handle case when GetDeviceEntryBySessionId is null

VCM's l.553 uses GetDeviceEntryBySessionId(request->first) without
checking the result, that could be null, and is, speculatively, the
root cause of the crashes linked in the bug.

BUG=655522

Committed: https://crrev.com/124fafd9aae60044673495b39a775a931cbdf90e
Cr-Commit-Position: refs/heads/master@{#425072}
==========

[commit-bot: I haz the power, 2016-10-13 17:17:27]

Patchset 1 (id:??) landed as
https://crrev.com/124fafd9aae60044673495b39a775a931cbdf90e
Cr-Commit-Position: refs/heads/master@{#425072}