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Previously, not all screen share sessions would stop and the shelf UI would not
indicate that there was a screen share session.

Bug: 826041
Change-Id: Ia32bf38e6a0dc158037d9d482e5b2bba6edf17f5
Reviewed-on: https://chromium-review.googlesource.com/993761Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550453}