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The dropdown will replace the checkbox that is currently in place to
control whether media remoting is enabled.

Note that this is not meant to be the final iteration of the UX; it is
however an improvement over the existing checkbox and is a reasonable
interim solution (while we gather feedback + do another UX study)

Screenshots:
LTR: https://screenshot.googleplex.com/dSPAZY4yHd5
RTL: https://screenshot.googleplex.com/apBUWUvp74q

BUG=774245

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I296c47cae0ecf4d16b5b645f92af00a2e1161d4f
Reviewed-on: https://chromium-review.googlesource.com/804138
Commit-Queue: Derek Cheng <imcheng@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521604}