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Open Screen does not end the Cast Streaming session on MessagePort
disconnect. This change ends the session on the receiver end when the
Cast Streaming MessagePort disconnects.
This is a necessary change to unit test the Cast Streaming Receiver.

Bug: 1110490
Change-Id: I272da7bad03c5f7efa31d3a8eb30f3ebdfe49f23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572167
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833865}