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The UI Service is not specific to WebUI, so c/b/ui/media_router/ is a
more appropriate directory for it.

TBR=bauerb@chromium.org

Change-Id: I29b150969511a533bba1188f2466160537c28285
Reviewed-on: https://chromium-review.googlesource.com/1159381Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579993}