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In screen capture it is possible to have multiple sessions associated to
the same device in the same renderer process.
Prior to this CL, MSM::StopStreamDevice() received only the device ID,
which sometimes resulted in the wrong screen-capture tracks being stopped
on the renderer side.
This CL adds the session ID to the StopStreamDevice() so that only the
correct track is stopped.

Bug: 788400
Change-Id: If759af86fa9819e4c3574b2bc840ad45c3c924b7
Reviewed-on: https://chromium-review.googlesource.com/892859Reviewed-by: Henrik Boström <hbos@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533828}