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This method forwards to MediaStreamManager::OpenDevice(), which
DCHECKs for the stream type to be device video or audio capture
(i.e., webcam or mic). However, MSDH admits other stream types,
which cause MSM::OpenDevice to hit this DCHECK.

This CL ensures that a message containing an incorrect stream type,
which could be sent by a malicious renderer, results in killing the
renderer process.

Bug: 1135018
Change-Id: I3884dde95d92c41f44966a8ab1dd7bdfd4b23b9b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2472397
Auto-Submit: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817151}