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We've received reports from enterprise customers using the
browser on a virtual machine that screen sharing (via Teams,
Google Meet, etc.) will unexpectedly end. The issue was traced
back to the browser receiving a WTS_SESSION_LOCK event, it
looked as if the user had locked their screen. In response
to this event the browser ends any active screen sharing
sessions.

The issue is that those lock events were coming from other
VMs hosted on the same server. We are not interested in
the events caused by other sessions, so we should only
register for changes to the current session. The affected
customer has verified that this fix has resolved the issue.

content::VideoCaptureManager is the only class that
observes these events, so there should be no other
side effects to this change.

Bug: 1163572
Change-Id: Icfa5629eb17298f7150dedfd650b77cb34887cfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2598389
Commit-Queue: Austin Orion <auorion@microsoft.com>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843328}